The Communist Party of South Africa (CPSA) was formed in 1921 and focused on organising African workers, workers' rights and trade unions
During industrialisation, the CPSA organised workers in new factories
CPSA membership grew during WW2, but was never widespread
The government saw the CPSA as a threat to Afrikaner unity. The CPSA's role in organising the 1946 Mineworkers' strike made the National Party accuse the United Party of being too lenient on Communism
The 1950 Suppression of Communism Act banned the CPSA and the spreading of communist ideas
Banning orders under the Suppression of Communism Act restricted political leaders and activists
The 1953 Native Labour Act banned employers from recognising African union and stopped African unions from negotiating with other unions
The 1953 Criminal Law Amendment Act gave punishments for people who protested or supported campaigns against the law
The 1953 Public Safety Act gave the government the power to declare a state of emergency and detain people without trial
After the CPSA was disbanded in 1950, the members formed the South African Communist Party (SACP) in 1953 or joined other protest groups like the SAIC, ANC, CPC or CD