. . . . "1899" . . . . . "USDP" . . . . . "social democrats" . "Ukrainian Social Democratic Party (1899)" . "Social Democrat" . . . . . . . "1939-09-01" . . "1939" . . . . . . . . "Ukrainian Social Democratic Club" . . . "Ukrainian Social Democratic Party (1899)" . "1899-08-17" . . . . . "Ukrainian Social Democratic Party" . .