The organisation supported the October Revolution, and Peet became its representative to the Hands Off Russia movement. It hoped to affiliate to the Third International; this was not permitted, as it was not a political party, but it joined the Red International of Labour Unions, Peet and Ted Lismer becoming joint secretaries of its British Bureau. The Shop Stewards' Committee became part of the National Workers' Committee in 1921, and Peet was prominent in its calls for a general strike on Black Friday. This was unsuccessful, and Peet was arrested, jailed for a month, and fined £100. The National Workers' Committee in turn merged with the British Bureau in 1922, Peet remaining joint secretary for a year, after which the Comintern ordered that Willie Gallacher and J. R. Campbell replace him and Lismer. In 1920, the BSP became part of the new Communist Party of Great Britain (CPGB), and Peet served on its Manchester District Committee. However, his replacement as secretary of the British Bureau appears to have shaken his support for the party; he resigned from the CPGB some time after 1923, and did not undertake any further political activity. Peet remained active in the ASE, and was one of its delegates to the Trades Union Congress in 1918. He also served as a tutor for the Manchester Labour College. The ASE became the Amalgamated Engineering Union, and Peet devoted himself to the branch, and was still branch treasurer when he died, in 1967.