Relief Camp Workers' Union was a Canadian Great Depression era relief union in which the workers employed in the Canadian government relief camps organized themselves into in the early 1930s. The RCWU was established by the Workers' Unity League and was associated with the Communist Party of Canada.[1] The creation of the union was a direct response to the conditions of the camps and the lack of financial compensation for the work the men provided. The union is best known for helping to organize the On-to-Ottawa Trek during the Great Depression.