According to Karl Marx what is the role of the communist party in the scheme of history?

Answer 1

In broad terms, Karl Marx believed the role of a communist party was to help organize the revolution of the proletariat as the first step towards the dictatorship of the proletariat.

Answer 2

Karl Marx believed that the communist party should serve as the vanguard of the proletariat, leading the working class in overthrowing the capitalist system. The party's role is to organize and mobilize the proletariat towards revolution, to establish a Dictatorship of the proletariat, and eventually usher in a classless society.