After Lenin's death in 1924, this man began purging rivals & eventually took over the top spot
[DOC] [TLE] Stalin: 1879-1944 [PAR] Likewise when on the death of Lenin he labelled Lenin's teachings as Leninism 
and ... Up to 1924 the disputes between Stalin and Trotsky had appeared to be ... 
of the Russian Empire began after he had become Lenin's second-in-command.