On this day, 10 June 1918, a mass rally of African workers took place in Johannesburg. They were protesting against the jailing of all 152 African municipal workers who had gone on strike for a shilling a day increase in pay. Radicals attempted to organise a general strike the following month, but it was called off, although thousands of miners did not hear about the cancellation and so walked out anyway.
More info in this pamphlet about struggles in South Africa at this time: https://libcom.org/history/sifuna-zonke%E2%80%99-revolutionary-syndicalism-industrial-workers-africa-fight-against-racial-c https://www.facebook.com/workingclasshistory/photos/a.296224173896073/1447331132118699/?type=3
