By Ted Hesson, ABC News
For decades, the traditional logic has held that unions and migrant labor don’t mix.
Cesar Chavez, the Mexican American labor hero, opposed the use of undocumented immigrants as “scabs” and even had union members form a “wet line” at border crossings to intimidate Mexican workers crossing into the U.S.
But there are indications that labor unions are now onboard with comprehensive immigration reform. And after they split over reform in 2007, the two biggest union groups, the AFL-CIO and Change to Win, have agreed to a common set of principles.