“At the end of 1903, Trotsky was an ardent Menshevik, i.e., he deserted from the Iskrists to the Economists. He said that ‘between the old Iskra and the new lies a gulf’. In 1904-05, he deserted the Mensheviks and occupied a vacillating position, now co-operating with Martynov (the Economist), now proclaiming his absurdly Left ‘permanent revolution’ theory.”
— V.I. Lenin. Collected Works Vol. 20. Moscow: Progress Publishers. 1977. p. 346.
The Espresso Stalinist 
Stalin is too rude and this defect, although quite tolerable in our midst and in dealing among us Communists, becomes intolerable in a Secretary-General. That is why I suggest that the comrades think about a way of removing Stalin from that post and appointing another man in his stead who in all other respects differs from Comrade Stalin in having only one advantage, namely, that of being more tolerant, more loyal, more polite and more considerate to the comrades, less capricious, etc. This circumstance may appear to be a negligible detail. But I think that from the standpoint of safeguards against a split and from the standpoint of what I wrote above about the relationship between Stalin and Trotsky it is not a [minor] detail, but it is a detail which can assume decisive importance.
Lenin
Taken down by L.F.
January 4, 1923
http://www.marxists.org/archive/lenin/works/1922/dec/testamnt/congress.htm