Claim: Gaston Monmousseau, a French railway worker, trade union leader, politician and author, from a rural working-class background, was elected propaganda secretary for the railway workers federation in 1920 and was arrested for plotting against state security and was released the following year, in which he became secretary-general of the Association of Trade Unions of the Paris district until 1922.
Evidence: Gaston Monmousseau (17 January 1883 – 11 July 1960) was a French railway worker, trade union leader, politician and author, from a rural working-class background. In April 1920 Monmousseau was elected propaganda secretary for the railway workers federation and was arrested, along with Souvarine and Monatte, for plotting against state security. He was released in February 1921. Monmousseau was secretary-general of the Association of Trade Unions of the Paris district from 1921 to 1922.