Communist Party USA and African Americans
The Communist Party USA, ideologically committed to fostering a socialist revolution in the United States, played a significant role in defending the civil rights of African Americans during its most influential years of the 1930s and 1940s. In that period, the African-American population was still concentrated in the South, where it was largely disenfranchised, excluded from the political system, and oppressed under Jim Crow laws.
Source: Wikipedia — Communist Party USA and African Americans (CC BY-SA 4.0)