David Korner (also known as Barta, Albert, and A. Mathieu; October 19, 1914 – September 6, 1976) was a Romanian and French communist militant, trade unionist, and journalist.

[1][2] In July 1933, alongside Gheorghe Gheorghiu-Dej, Constantin Doncea and other PCR activists, he was brought to trial in front of a Bucharest court for his part in convening the Griviţa Strike, and ultimately sentenced to 18 months in jail.

[1] When the Spanish Civil War and the June 1936 strikes took place, Korner again returned to France and was a member of the Internationalist Workers Party (POI).

[1] Upon the start of World War II, as the PSOP collapsed, he formed the tiny Trotskyist Group in opposition to what he considered the petty bourgeois methods of organization of the other French Trotskyist groups, as well as to the politics of mainstream socialist party (the French Section of the Workers' International).

[1] The request for support addressed by the newly formed Democratic Trade Union of Renault (SDR) was accepted by the UC, which effectively caused a merger between the two.