"‘We are leaders elected by the masses’, Comrade 
Crispien continues. That is a formal standpoint 
and incorrect, because at the last conference of 
the German Independents we quite clearly saw the 
struggle of the tendencies. One does not need to 
look for a sincerometer and make jokes about it 
like Comrade Serrati in order to know the simple 
fact that there is and must be a struggle of 
tendencies. One tendency is the revolutionaries, 
the workers who have just come to us, the enemies 
of the labour aristocracy. The other tendency is 
the labour aristocracy, which in all the civilised 
countries is represented by the old leaders. Does 
Crispien stand with the tendency of the old 
leaders and the labour aristocracy or with the 
tendency of the new, revolutionary mass of 
workers, who are opposed to the labour 
aristocracy? That is precisely what Comrade 
Crispien glossed over."

Source:
Lenin, July 30, 1920, "Minutes of the Second Congress of
the Communist International"

http://www.marxists.org/history/international/comintern/2nd-congress/ch07.htm

[MC5 adds: This comment is significant because
it clearly states that the labour aristocracy
is enemy. Some of our goofy "comrades" don't know
that. They think it is some wayward strata of 
"proletarians," instead of learning
that Lenin concluded that they were
new petty-bourgeoisie. It's also a significant quote, because Lenin
was not going to let any talk of "masses" obscure this
point.

Lenin also pointed out at about the same time that
a party even with the correct line would have to
periodically purge petty-bourgeois elements that
gradually accumulated or drifted in.]