John Smith "Jock" Garden was an Australian clergyman, trade unionist and politician. He was one of the founders of the Communist Party of Australia.

The Communist Party of Australia (CPA), known as the Australian Communist Party (ACP) from 1944 to 1951, was an Australian communist party founded in 1920. The party existed until roughly 1991, with its membership and influence having been in a steady decline since its peak in 1945. Like most communist parties in the West, the party was heavily involved in the labour movement and the trade unions. Its membership, popularity and influence grew significantly during most of the interwar period before reaching its climax in 1945, where the party achieved a membership of slightly above 22,000 members. Although the party did not achieve a federal MP, Fred Paterson was elected to the Parliament of Queensland at the 1944 state election. He won re-election in 1947 before the seat was abolished. The party also held office in over a dozen local government areas across New South Wales and Queensland.