Sergei Ivanovich Gusev (AKA "Gussev") (Russian: ?????´? ???´????? ??´???) ((real name - Yakov Davidovich Drabkin: Russian — ?´??? ????´????? ???´????) (1 January 1874-10 June 1933) was a Russian revolutionary, a founding member of the Bolshevik faction of the Russian Social Democratic Labour Party (RSDLP), and Soviet party leader.