FRSO seems good on most things, but supports "upholding past treaties" with native Americans, which is somewhat of a red flag. PSL seems good but I've heard claims that they're not that good on the settler colonial issue either and lack proper democratic centralist structure. I don't know much about the WWP, but their 15 point programm doesn't mention landback at all. I know next to nothing about the other socialist parties/orgs on the US, so I can't give my opinion on them
Where and what did you hear about the PSL's stances on settler-colonialism? I've learned to generally be cautious about any self-professed communist party in Seppoland, but my impression is that the PSL is one of the better parties yonder wrt Indigenous issues. It's really the CPUSA and "American Communist Party" that I've heard bad things about, while people generally seem to only praise the PSL in my experience.