You say the PSL doesn't play a class collaborationist role in the unions. Where is your evidence of this? Where is their public record of union work? The WWP certainly plays such a role. Not as the CPUSA does, no, again not that extreme and explicit but just last year WWP played a big role in my local's "fight" against layoffs (in other words the WWP helped them "look" militant while avoiding an actual mass struggle). Do you really think the PSL functions differently than that or do you have any evidence that they do?