The Cape Federation of Labour Unions which represented many coloured workers refused to do so.
It was active in the Rand Rebellion in 1922, but it largely collapsed following the defeat of the associated general strike.
The remnants of the federation attempted to reform as a single general union, the South African Industrial Union, but the government refused it permission to register, and it soon dissolved.
[1] Instead, the federation was replaced in 1924 by the South African Trades Union Council.
This article related to a South African trade union is a stub.