The American Left made its self useless by capitulating to the trade union bsoes racism, this prevented organizing of Black and Asian workers which made it easy for capitalists to use white workers as strike breakers against Black and Asian Workers,

When White Workers went on strike it made it easy to use black workers as strike breakers. It also fully undermined internationalism and lost them a lot of Eastern European especially Jewish support in New York and probably cost them elections.

Eventually the Communist Party would correct these issues, but then they turned around and threw it all away for popular frontism and siding with FDR, CPUSA basically was shit from that point on.

The American Left constantly fucks its self by capitulating to racism and bigotry and refusing to stand consistently with oppressed people. Idk how anyone could think the modern left making some efforts to not repeat this is a mistake and "idpol nonsense"