Sergey Vladimirovich Girinis,^[1][2] until 1919 known as Raul Isaakovich Ginzburg, was a Soviet revolutionary, journalist and trade unionist.^[1][3][4] He was a leading figure in the labour movement in Vilna (Vilnius) in the 1910s, adhering to a Menshevik-Internationalist line. He later joined the Communist Party of Lithuania. After a prisoner exchange, he was based in Moscow and represented Lithuanian trade unions in the Red International of Labour Unions (Profintern). Girinis was a prolific writer, authoring different works on political theory and history.

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