During World War II (1939–45) Sellier refrained from voting on the constitutional change that gave full power to Marshal Philippe Pétain.

He was removed from office on 22 June 1941 by the  Vichy authorities, arrested by the Gestapo and detained in the camp at Compiègne for almost a month.

He refused to work with collaborationist socialists and founded a socialist action committee, which became part of the French Resistance.

He died at the age of 59 on 24 November 1943 in Suresnes, Seine.

A large crowd defied a ban and attended his funeral.
During World War II (1939–45) Sellier refrained from voting on the constitutional change that gave full power to Marshal Philippe Pétain.
He was removed from office on 22 June 1941 by the  Vichy authorities, arrested by the Gestapo and detained in the camp at Compiègne for almost a month.
He refused to work with collaborationist socialists and founded a socialist action committee, which became part of the French Resistance.
He died at the age of 59 on 24 November 1943 in Suresnes, Seine.
A large crowd defied a ban and attended his funeral.
Henri Sellier