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no, i don't think that's the motivation. i cannot speak for the others though i would guess many of them share my sentiment when i say that it is only on a left list that we have the luxury of discussing these issues. in the real world, i have never crossed a line, nor would i even criticize unions (lest we give an inch to our enemies!).
i read on the web that the AFL-CIO reversed its anti-undocumented-workers position only in 2002, and some claim this was a selfish decision to grow the ranks (given drop in union membership among citizens). it is a tough real world problem to keep unions inclusive (in the best sense) and relevant. kelley or someone else wrote that we should honour the picket line but work within the union to effect changes -- i do not claim to have a better alternative.
--ravi