I agree, tho as others are pointing out, the social relation of settlerism is fundamental to this phenomenon in the US. No surprise that the big union at the end of the american frontier is like this consistently. I wouldn't say it is indirectly connected to settler colonialism, just that like you said at the end, there is more at play here.

As some aholes on twitter are happily pointing out, a lot of the ILA members are African American. Not only does the gains of settlerism also impact them even as they are mistreated, but the social chauvinism inherent to this union and most craft unions would seal the deal even without that. I am essentially being a centrist on this because I think people should recognize the impact of what Sakai was talking about on this, as well as the shortcomings of unionism and that even in a third world country or among largely oppressed populations in the US, there is a material incentive beyond settlers that makes this kind of chauvinism prevalent