From that time on, she campaigned for absolute equality between men and women, which, according to her, would only be possible with the transformation of economic structures and the implementation of socialism.

She remarried on 23 March 1926, with the union leader Georges Buisson, who in 1929 became the adjunct secretary of the General Confederation of Labour (CGT).

She made numerous forays around the country to distribute Resistance literature and participate in actions supporting the Socialist activists arrested by the Vichy regime or German authorities.

In March 1943, when the CAS effectively became a reunited, clandestine SFIO, Suzanne Buisson became a member of its political bureau.

Léon Blum paid her homage in the edition of 2 February 1946 of Le Populaire, "She was the accomplished, exemplary activist of whom the party could ask anything, who never shirked her duties, but on the contrary, could be relied upon to fulfill them with absolute devotion and disinterest.