Seeing the conversations around this topic in the post Most Western Parties Are Ossified and Failures I thought some folks might find value in this organizing guide created by USU. It draws from numerous articles they’ve written about organizing ML orgs from the ground up.
1917 general strike was organized by IWW who, while surviving today, is not a party but a trade union.
William Z. Foster joined the CPUSA. The two fledgling parties also played a role.