From the Montpellier Congress of the CGT in September 1902, the secretary of the Bourses section was automatically secretary of the GCT, and thus in title was second in the trade union leadership.
In December 1902 Yvetot was one of the founders of the Ligue antimilitariste, along with fellow anarchists Henri Beylie, Paraf-Javal, Albert Libertad and Émile Janvion.