The Canadian Labour Defence League was a legal defence organization founded and led by Reverend A.E. Smith. The league was in 1925 as a civil rights organization dedicated to protecting striking workers from persecution. It was allied with the Communist Party of Canada and functioned as a front for the party. The group was the Canadian affiliate of International Red Aid. The group became less active as the end of the decade approached and was banned in 1940 under the Defence of Canada Regulations.