Malcolm X was effectively orphaned early in life. His father was killed when he was six and his mother was placed in a mental hospital when he was thirteen, after which he lived in a series of foster homes. In 1946, at age 20, he went to prison for larceny and breaking and entering. While in prison, Malcolm X became a member of the Nation of Islam, and after his parole in 1952, quickly rose to become one of the organization's most influential leaders. He served as the public face of the controversial group for a dozen years. In his autobiography, Malcolm X wrote proudly of some of the social achievements the Nation made while he was a member, particularly its free drug rehabilitation program. The Nation promoted black supremacy, advocated the separation of black and white Americans, and rejected the civil rights movement for its emphasis on integration.