Both men were involved in the French Communist Party (PCF) and Solomon-Langevin became a member of the World Committee of Women against War and Fascism.

Having become members of the French Resistance, the couple were both arrested during 1942; Jacques was killed by firing squad in May, while Hélène was imprisoned in the Fort de Romainville.

Placed third on the PCF list, she was one of 33 women elected, and became a member of the National Education Commission.

Solomon-Langevin began working part-time as a librarian at the French National Centre for Scientific Research in 1948, becoming a full-time employee in 1952.

In 1958 she married André Parreaux, an academic and the couple adopted a daughter, Michèle Norel.