Revolutionary Workers League (Oehlerite)

Though the idea was favored by James Cannon and Max Shachtman, the two former leaders of the CLA, it was opposed by Joseph Zack Kornfeder and Muste.

Things came to a head at the October 4–9, 1935 Plenum of the party's National Committee, at which the Oehler-Stamm group was forbidden to issue a factional periodical and were given a final warning to cease their violations of "organizational discipline".

Joseph Zack then renounced Marxism completely, and founded a new group called the One Big Union Club.

Others reasons given for the split included questions over democratic centralism as well as a supposed tendency to focus too much on European events, but Sidney Lens stated that Stamm's motivation was more personal: he simply did not wish to relocate from New York to Chicago, where the RWL's headquarters was being transferred to become closer to the heart of America industry.

[8][9] Other groups to split from the RWL included the Leninist League, led by George Marlen, a second Marxist Workers League led by Karl Mienov, a group headed by David Atkins that merged into the Bordigists, and the Revolutionary Communist Vanguard.

[10] The group sent a man named Russel Blackwell (using the pseudonym Rosalio Negrete) to Spain during the early part of the Spanish Civil War, who made contacts to the Workers' Party of Marxist Unification (POUM) left wing.

Besides themselves, this included the Leninist League (UK) and the Revolutionary Communist Organisation (Austria), both groups close to Oehler.