Essentially the idea that a violent any means necessary over throw by a people's vanguard is the only effective means over transition through existing frameworks. That the result needs to be a "democratic " (pseudo-democratic in practice) one party dictatorship of the proletariat in control of a socialist goverment made up of elected councils (soviets) representing various factions of the proletariat, military, former peasentry, and intelligencia. Also that for communism to ever be achieved there needs to be active support and influence worldwide for other overthrows of capitalist regimes. All gathered behind a revolutionary figurehead to rally the cause.
@irishmolly72 there is no freedom under capitalism just economic coercion being sold to you as "freedom". Also the "third world" on the backs of which capitalist consumerism is built would disagree.