Labor unions have never been especially pro-immigration as a group -- it's highly dependent on their membership and whether it is growing or shrinking and how a

Labor unions have never been especially pro-immigration as a group -- it's highly dependent on their membership and whether it is growing or shrinking and how and why it is growing or shrinking. If you're a union that is largely concerned with preserving jobs and privileges in a shrinking industry, then there is a pretty good chance that you are going to be quite opposed to non-union immigrants coming in and "taking your jobs." If you're a farm-worker union with a growing membership of immigrants, more concerned about adding new members and organizing than with preserving previous wins, you may be quite in favor of more immigration.