SARA BURNETT, Associated Press

CHICAGO (AP) — Unions across the U.S. are reaching out to immigrants affected by President Obama’s recent executive action in hopes of expanding their dwindling ranks by recruiting millions of workers who entered the U.S. illegally.

Labor leaders say the action will give new protection to workers who’ve been reluctant to join for fear of retaliation. The action curbs deportation and gives work permits to some 4 million immigrants.

Service Employees International Union Local has announced a website where immigrants can learn about the action. The AFL-CIO says it’s training organizers to recruit eligible workers. Other unions are partnering with community groups to reach out to immigrants.

Opponents meanwhile are working to undo the action, saying it will hurt American workers. Some labor experts are skeptical immigrants will feel safe enough to unionize.