Joe Slovo (23 May 1926 – 6 January 1995) was a South African politician, long-time leader of the South African Communist Party (SACP), and leading member of the African National Congress.
Slovo was born in Obeliai, Lithuania to a Jewish family who emigrated to South Africa when he was eight. His full name was Yossel Mashel Slovo. His father worked as a truck driver in Johannesburg. Although his family were religious, he became an atheist who retained respect for "the positive aspects of Jewish culture". Slovo left school in 1941 and found work as a dispatch clerk. He joined the National Union of Distributive Workers and, as a shop steward, was involved in organising a strike.
Slovo joined the South African Communist Party in 1942. Inspired by the Red Army's battles against the Nazis on the Eastern Front of World War II, Slovo volunteered to fight in the war, afterwards joining the Springbok Legion, a multiracial radical ex-servicemen's organization, upon his return.
Between 1946 and 1950 he completed a law degree at Wits University and was a student activist. He was in the same class as Nelson Mandela and Harry Schwarz. In 1949 he married Ruth First, another prominent Jewish anti-apartheid activist and the daughter of SACP treasurer Julius First. They had three daughters, Shawn, Gillian and Robyn. First was assassinated in 1982 by order of Craig Williamson, a major in the Apartheid security police.