How are successful communist parties founded?

How are successful communist parties founded or established?By successful, I mean parties that either:A) Grow large enough to field a significant electoral and national presence (I'm thinking of the CPUSA or IWW of the '30s--not a party, I know, but effective in its own right nevertheless)B) Are strong enough, in some respect, to launch a revolution.In the US, as in many parts of the world, there is no single membership-based organization with enough size, influence, or appeal to call itself an effective communist party. One way or another, it will be necessary in the US to either grow an organization into an effective party or to bring a new one into existence. Deciding which path to take depends a lot, I think, on the historical experiences of the parties of the past.All of the communist histories that I've read, however, pick up their stories with the various communist parties already in existence and already commanding significantly greater public interest and influence than any existing communist party in the US.No doubt local conditions will have a huge impact on which direction to take. All the same, if a successful communist party is to exist in the US, how should it come into existence? Gradually organizing more and more workers around an existing organization (PCUSA, PSL, DSA, SRA, IWW, et al)? Building a coalition of organizations that will merge at some future convention? Growing a socdem org like the DSA until it can field a large enough electoral slate that it challenges the existing parties, and uses that as a platform to grow into a full-fledged party? Starting a whole new org from the ground up? I'm totally lost here and each of these approaches seems to have an advantage and a disadvantage. via /r/communism https://ift.tt/3c0jyii