My friends at the Center for Economic Policy and Research have this new report:

This report reviews the characteristics of the immigrant workforce and analyzes the impact of unionization on the pay and benefits of immigrant workers. According to the most recent available data, immigrant workers are now over 15 percent of the workforce and almost 13 percent of unionized workers. Even after controlling for systematic differences between union and non-union workers, union representation substantially improves the pay and benefits received by immigrants.

   It’s no surprise, actually. The labor movement lifts wages for all workers. But, particularly for immigrants, and undocumented immigrants who are the most vulnerable to exploitation by employers, the data is pretty clear.