Party First Duma Second Duma Third Duma Fourth Duma
Russian Social Democratic Party 18 (Mensheviks) 47 (Mensheviks) 19 (Bolsheviks) 15 (Bolsheviks)
Socialist-Revolutionary Party 37
Labour group 136 104 13 10
Progressist Party 27 28 28 41
Constitutional Democratic Party (Kadets) 179 92 52 57
Non-Russian National Groups 121 26 21
Centre Party 33
Octobrist Party 17 42 154 95
Nationalists 60 93 26 22
Rightists 8 10 147 154
TOTAL 566 453 465 448