Aspects of this topic are discussed in the following places at Britannica.
...were illegal and often were put down with violence. Nevertheless, the period 1918–22 saw a great deal of working-class militancy, and in 1920 Clements Kadalie, a Nyasaland migrant, founded the Industrial and Commercial Workers’ Union (ICU). Initially consisting of dockworkers in Cape Town, the ICU spread rapidly as a mass movement in the towns and in the countryside, where those who had...
in South Africa: The Pact years (1924–33) )The first mass-based black political organization, the Industrial and Commercial Workers Union (ICU), flourished in response to deteriorating conditions. Until 1926 the ICU was a Cape-based organization with black and some Coloured members drawn mainly from urban areas. As a broadly based vehicle of rural protest, it had many thousands of supporters among black tenants on white farms. The ICU...
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