Lockheed Martin workers are unionized. Undocumented farm workers are not. It seems pretty obvious to me that any socialist should want it to be the other way around and it's gonna take labor organizing (+ serious political struggle) to make it so. So it's just like any other thing, the contradictions are fluid and constantly in motion, therefore you have to evaluate how things relate to the primary contradiction at any given time and make your decisions based on that. There is no blanket answer.