Left Opposition
The Left Opposition was a faction within the Russian Communist Party ( b ) from 1923 to 1927 headed "de facto" by Leon Trotsky . 
<triplet> Left Opposition <subj> Russian Communist Party (b) <obj> part of <subj> Leon Trotsky <obj> chairperson <triplet> Leon Trotsky <subj> Left Opposition <obj> member of <subj> Russian Communist Party (b) <obj> member of political party