Question

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Answer 1

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Bolsheviks (and Lenin) believed in the necessity of a revolution led and controlled by the proletariat only, whereas Mensheviks (and Martov) believed that a collaboration with the bourgeoisie was necessary; ... Bolsheviks were radical revolutionaries while Mensheviks were more moderate.

Answer 2

Bolsheviks thought that the quality of the party should be maintained and the quality and quantity of people should be kept in consideration...

Whereas

Mensheviks belived that the party should be open to all.....