Increasingly prominent in his trade union work, in 1916 he came eighth out of twenty-two candidates for the assistant general secretaryship of the ASE.
They and their colleagues then agreed to sign an agreement between the ASE and the Ministry of Munitions which settled the strike and, as a result, Peet and MacManus were released.
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.
[2] 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.