Title: Professionalʹnye soi︠u︡zy i sot︠s︡ialdemokraticheskai︠a︡ partii︠a︡
Subjects: Socialism, History, Labor unions, Politics and government, Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡
Places: Europe, Soviet Union