13 July 1906,
Fourteen unemployed people occupied a plot in London and started growing it. They called him Triangle Camp, set the red flag and a tent. To confront the belief that those who had no work were useless, they organized an eight-hour day and banned alcoholic beverages. They had the support of thousands of people until they were evicted by the police.
Source:
John Field, Working men’s bodies: Work camps in Britain, 1880–1940