agrarian socialism alexander kerensky bolshevik boris savinkov catherine breshkovsky communist party of the soviet union constitutional democratic party february revolution georgy lvov grand duke sergei alexandrovich of russia grigory gershuni grigory zinoviev july days left socialist-revolutionaries leon trotsky lev kamenev london maria spiridonova mark natanson menshevik military revolutionary committee moscow narodnik nicholas ii of russia october revolution okhrana petrograd soviet populism russian civil war russian constituent assembly russian provisional government russian social democratic labour party russian language sr combat organization socialism state duma tambov rebellion third russian revolution treaty of brest-litovsk tsar tsentralna rada vadim rudnev vladimir burtsev vladimir lenin world war i yevno azef