The Communists’ proper tactics should consist in utilising these vacillations, not ignoring them; utilising them calls for concessions to elements that are turning towards the proletariat—whenever and in the measure that they turn towards the proletariat—in addition to fighting those who turn towards the bourgeoisie.

Make this lower case
the communists’ proper tactics should consist in utilising these vacillations, not ignoring them; utilising them calls for concessions to elements that are turning towards the proletariat—whenever and in the measure that they turn towards the proletariat—in addition to fighting those who turn towards the bourgeoisie.