The PSL (just like the ACP) is an anti-revolutionary "party".
https://www.geesemag.com/articles/psls-top-propagandist-resigns-publishes-tell-all

PSL's Top Propagandist Resigns, Publishes Tell-All Letter — geese magazine.
A dramatic resignation letter from one of the PSL's top leaders accuses the organization of secrecy, factionalism, and bureaucratic decay. The controversy has reignited questions about the future of America's socialist micro-parties.