• Prime Minister of Sweden Sven Olof Joachim Palme, 1927

A pivotal, renowned and polarizing figure domestically as well as in international politics since the 1960s until his death, Palme was steadfast in his non - alignment policy towards the superpowers, juxtaposed to support of numerous third world liberation movements following the process of decolonization including, most controversially, economic and vocal support for a number of non - democratic anti - imperialist regimes. In 1975, he was the first head of a democratic government to visit Cuba after its revolution, holding a speech on Plaza de la Revolución praising Fidel Castro's administration and issuing a joint statement vindicating Pol Pot's takeover in Cambodia.

Frequently a critic of US and Soviet foreign policy, he resorted to fierce and often polarizing criticism in pinpointing his resistance towards imperialist ambitions and authoritarian regimes, including those of Francisco Franco of Spain, Gustáv Husák of Czechoslovakia, and B J Vorster and P W Botha of South Africa. Palme's steadfast opposition to apartheid, which he labeled "a particularly gruesome system", has elevated theories of South African involvement in his death some of the most prolific even a quarter of a century after his assassination. His murder by an unapprehended assailant on a street in Stockholm on February 28, 1986 was the first of its kind in modern Swedish history, the first of a national leader since Gustav III, and had a great impact across Scandinavia.

Palme was born into an upper class, conservative family in Östermalm, Stockholm, Sweden. His father, a businessman, was of Dutch ancestry and his mother, Freiin von Knieriem, was of Baltic German origin. Palme's father died when he was six years old. Despite his upper class background, his political orientation came to be influenced by Social Democratic attitudes. His travels in the Third World, as well as the United States, where he saw deep economic inequality and racial segregation, helped to develop these views.

A sickly child, Olof Palme received his education from private tutors. Even as a child he gained knowledge of two foreign languages. He studied at the Sigtuna School of Liberal Arts, one of Sweden's few residential high schools, and passed the university entrance examination with high marks at the early age of 17. He did brief military service and enrolled at the University of Stockholm.

On a scholarship, he studied at Kenyon College, Ohio 1947 – 1948, graduating with a B.A. in less than a year. Inspired by radical debate in the student community, he wrote a critical essay on Friedrich Hayek's The Road to Serfdom. Palme wrote his senior honor thesis on the United Auto Workers union, led at the time by Walter Reuther. After graduation he traveled throughout the country and eventually ended up in Detroit, where his hero Reuther agreed to an interview which lasted several hours. In later years, Palme regularly remarked during his many subsequent American visits, that the United States had made him a socialist, a remark that often has caused confusion. Within the context of his American experience, it was not that Palme was repelled by what he found in America, but rather that he was inspired by it.

After hitchhiking through the USA and Mexico, he returned to Sweden to study law at Stockholm University. In 1949 he became a member of the Swedish Social Democratic Party. During his time at university, Palme became involved in student politics, working with the Swedish National Union of Students. In 1951, he became a member of the social democratic student association in Stockholm, although it is asserted he did not attend their political meetings at the time. The following year he was elected President of the Swedish National Union of Students. As a student politician he concentrated on international affairs and traveled across Europe.

Palme attributed his becoming a socialist to three major influences:

• In 1947, he attended a debate on taxes between the Social Democrat Ernst Wigforss, the conservative Jarl Hjalmarson and the liberal Elon Andersson;
• The time he spent in the United States in the 1940s made him realize how wide the class divide was in America, and the extent of racism against black people; and,
• A trip to Asia, specifically India, Ceylon (Sri Lanka), Burma, Thailand, Singapore, Indonesia and Japan in 1953 had opened his eyes to the consequences of colonialism and imperialism.

In 1953, Palme was recruited by the social democratic prime minister Tage Erlander to work in his secretariat. From 1955 he was a board member of the Swedish Social Democratic Youth League and lectured at the Youth League College Bommersvik. He also was a member of the Worker's Educational Association.

In 1957 he was elected as an Member of Parliament (Swedish: riksdagsledamot) represented Jönköping County in the directly elected First Chamber (Första kammaren) of the Riksdag. In the early 1960s Palme became a member of the Agency for International Assistance (NIB) and was in charge of inquiries into assistance to the developing countries and educational aid. In 1963, he became a member of the Cabinet - as Minister without Portfolio in the Cabinet Office, and retained his duties as a close political adviser to Prime Minister Tage Erlander. In 1965, he became Minister of Transport and Communications. One issue of special interest to him was the further development of radio and television, while ensuring their independence from commercial interests. In 1967 he became Minister of Education, and the following year, he was the target of strong criticism from left wing students protesting against the government's plans for university reform. The protests culminated with the occupation of the Student Union Building in Stockholm; Palme came there and tried to confront the students, urging them to use democratic methods for the pursuit of their cause. When party leader Tage Erlander stepped down in 1969, Palme was elected as the new leader by the Social Democratic party congress and succeeded Erlander as Prime Minister.

His protégé and political ally, Bernt Carlsson, who was appointed UN Commissioner for Namibia in July 1987, also suffered an untimely death. Carlsson was killed in the Libyan terrorist bombing of Pan Am Flight 103 over Lockerbie, Scotland, on 21 December 1988 en route to the UN signing ceremony of the New York Accords the following day.

Palme was said to have had a profound impact on people's emotions; he was very popular among most left wing sympathizers, although an outspoken anti - communist, but harshly detested by most liberals and conservatives. This was due in part to his international activities, especially those directed against the US foreign policy, and in part to his aggressive and outspoken debating style.

As leader of a new generation of Swedish Social Democrats, Olof Palme was often described as a "revolutionary reformist". Domestically, his socialist views — especially the Social Democrat drive to expand Labor Union influence over business — engendered a great deal of hostility from more conservatively inclined Swedes.

Olof Palme carried out major reforms in the Swedish constitution such as orchestrating a switch from bicameralism to unicameralism in 1969 and in 1975 replacing the 166 year old Instrument of Government (at the time the oldest political constitution in the world after that of the United States) with a new one officially establishing parliamentary democracy rather than de jure monarchic autocracy, abolishing the Privy Council of Sweden and stripping King Carl XVI Gustav of most rights held even by ceremonial monarchs in Denmark, Norway and the United Kingdom.

His reforms on labor market included establishing a law which increased job security. In the Swedish 1973 general election the Socialist - Communist and the Liberal - Conservative blocs got 175 places each in the parliament. The Palme administration continued to govern the country but several times they had to draw lots to decide on some issues, although most important issues were decided through concessional agreement.

Under Olof Palme's government matters concerned with child care centers, social security, protection of the elderly, accident safety and housing problems received special attention. Under Palme the public health system in Sweden became incredibly efficient, with the infant mortality rate standing at 12 per 1,000 live births. An ambitious redistributive program was carried out, with the Swedish welfare state significantly expanding from a position already one of the most far reaching in the world during his time in office, while tax rates rose from being fairly low even by European standards to the highest levels in the Western world.

An outspoken supporter of gender equality, Palme sparkled interest for women's' rights issues by attending a World Women's Conference in Mexico. In 1968 Palme was a driving force behind the release of documentary Dom kallar oss mods. The controversial movie, depicting two social outcasts, was scheduled to be released in an edited form but Palme thought the material was too socially important to be cut.

As a forerunner in green politics Olof Palme was a firm believer in nuclear power as a necessary form of energy, at least for a transitional period to curb the influence of fossil fuel. His intervention in Sweden's 1980 referendum on the future of nuclear power is often pinpointed by opponents of nuclear power as saving it. As of 2011, nuclear power remains one of the most important sources of energy in Sweden, much attributed to Palme's actions.

Shortly before his assassination, Palme had been accused of being pro - Soviet and not sufficiently safeguarding Sweden's national interest. Arrangements had therefore been made for him to go to Moscow to discuss a number of contentious bilateral issues, including alleged Soviet submarine incursions into Swedish waters.

On the international scene, Palme was a widely recognized political figure because of his:

• harsh and emotional criticism of the United States over the Vietnam War;
• vocal opposition to the crushing of the Prague Spring by the Soviet Union;
• criticism of European Communist regimes, including labeling the Husák regime as "cattle of dictatorship" (Swedish: "Diktaturens kreatur") in 1975;
• campaigning against nuclear weapons proliferation;
• criticism of the Franco Regime in Spain, calling the regime "devilish murderers" (Swedish: "Satans mördare") after its execution of ETA and FRAP nationalists in September 1975;
• opposition to apartheid, branding it as "a particularly gruesome system", and support for economic sanctions against South Africa;
• support, both political and financial, for the African National Congress (ANC) and the Palestine Liberation Organization (PLO);
• visiting Fidel Castro's Cuba in 1975, during which he denounced Fulgencio Batista's government and praised contemporary Cuban and Cambodian revolutionaries;
• strong criticism of the Pinochet Regime in Chile;
• support, both political and financial, for the FMLN - FDR in El Salvador and the Nicaragua under FSLN; and,
• role as a mediator in the Iran - Iraq War.

All of this ensured that Palme had many opponents (as well as many friends) abroad.

On 21 February 1968, Palme (then Minister of Education) participated in a protest in Stockholm against the U.S. involvement in the war in Vietnam together with the North Vietnamese Ambassador to the Soviet Union Nguyen Tho Chan. The protest was organized by the Swedish Committee for Vietnam and Palme and Nguyen were both invited as speakers. As a result of this, the U.S. recalled its Ambassador from Sweden and Palme was fiercely criticized by the opposition for his participation in the protest.

On 23 December 1972, Palme (then Prime Minister) made a speech in Swedish national radio where he compared the ongoing U.S. bombings of Hanoi to a number of historical atrocities, namely the bombing of Guernica, the massacres of Oradour - sur - Glane, Babi Yar, Katyn, Lidice and Sharpeville, and the extermination of Jews and other groups at Treblinka. The USA government called the comparison a "gross insult" and once again decided to freeze its diplomatic relations with Sweden (this time the freeze lasted for over a year).

Despite such associations and contrary to stated Social Democratic Party policy, Sweden had in fact secretly maintained extensive military co-operation with NATO over a long period, and was even under the protection of a US military security guarantee (Swedish neutrality during the Cold War).

Asked about Palme, former United States Secretary of State Henry Kissinger once answered that he usually disliked the people he agreed with and liked the people he disagreed with, adding dryly: "So Palme, I liked - a lot". In response to Palme's remarks in a meeting with the US ambassador to Sweden ahead of the Socialist International Meeting in Helsingor in January 1976, Kissinger asked the US ambassador to "(...) convey my personal appreciation to Palme for his frank presentation (...).

Security had never been a major issue, and Olof Palme could often be seen without any bodyguard protection. The night of his murder was one such occasion. Walking home from a cinema with his wife Lisbet Palme in the central Stockholm street Sveavägen, close to midnight on 28 February 1986, the couple was attacked by an assassin. Palme was fatally shot in the back at close range. A second shot was fired at Lisbet Palme, the bullet grazing her back. She survived without serious injuries.

Police said that a taxi driver used his mobile radio to raise the alarm. Two young girls sitting in a car close to the scene of the shooting also tried to help the prime minister. He was rushed to hospital but was pronounced dead on arrival at 00:06 CET the next day. Mrs Palme's wound was treated and she recovered. Deputy Prime Minister Ingvar Carlsson immediately assumed the duties of Prime Minister and as new leader of the Social Democratic Party, a post he would retain until 1991 (and then again in 1994 - 1996).

Two years later, Christer Pettersson (d. 2004), a small time criminal and drug addict, was arrested, tried and convicted for Palme's murder. Pettersson's conviction was later overturned on appeal to the Svea Court of Appeal. As a result the crime remains unsolved and a number of alternative theories as to who carried out the murder have since been proposed.

Palme had strong opinions on both the world powers in the middle of the Cold War. In fact, Swedish – American relations were at a record low due to Palme's rough criticism of the Vietnam War and the placement of nuclear weapons in Europe, which he opposed. Therefore there is a popular conspiracy theory that he was assassinated by either the Soviet KGB or the American CIA. South African assassin Athol Visser also discusses his involvement in the book Devil Incarnate describing it as part of P W Botha's apartheid government's campaign to silence domestic and foreign enemies.

In January 2011 the German magazine Focus cited German interrogation records in connection with another investigation from 2008 as showing that the assassination had been carried out by an operative of the Yugoslavian UDBA who now lives in Zagreb, Croatia.