[1] In 1933 he joined the French Communist Party while he was already a member of Association des écrivains et artistes révolutionnaires, where he met painters such as Jean Hélion, Auguste Herbin, André Marchand, Maurice Estève and Vieira da Silva as well as writers such as Louis Aragon.

[1] Alongside artists like Jean Bazaine, Esteve, Le Moal and Alfred Manessier, Pignon was one of "Twenty painters of French tradition", who exhibits in Paris at the Braun Galery in 1941 in order to resist the Nazi theory of "degenerate art".

[3] In 1956, after the Soviet invasion of Hungary, he was one of ten intellectuals of the PCF alongside who wrote a letter to the party leadership expressing their dismay and condemning the suppression of the Hungarian uprising.

Throughout the 1960s and 70s his worka have been exhibited in Metz, New York, Amsterdam, Lucerne, Milan, Udine, Padua, Venice, Trieste, Bucharest, Antibes.

In 1981, the French Post Office issued a stamp with a reproduction of one of his paintings, “Red Nudes.” In 1985, an exhibition of his works was displayed on three floors of the Grand Palais in Paris.