He joined the National Amalgamated Furnishing Trades Association (NAFTA), soon winning election to its executive committee, and in 1929 also joined the Communist Party of Great Britain.
[3][4] He visited Moscow twice in the early 1930s, and was also an organiser of the National Hunger March.
In 1932, he was a founder of the British Anti-War Council, serving as its national secretary.
[4] The NAFTA merged into the National Union of Furniture Trade Operatives (NUFTO), and Shube was appointed as its national convener for Co-operative Wholesale Society furniture and bedding workers, also serving as the union's president from 1947.
[4][5] In 1952, Shube was elected as one of NUFTO's two full-time assistant general secretaries, focusing his time on the union's finances and administration.