CHICAGO (AP) — The nation's first teachers' strike against a charter school operator will end after their union and management struck a tentative deal Sunday that includes protections for students and immigrant families living in the country illegally.

The Chicago Teachers Union said more than 500 teachers will return to classes Monday at Acero's 15 schools with 7,500 predominantly Latino students. Teachers went on strike Tuesday and classes were canceled.

Robert Bloch, general counsel for the union, said that since the schools' enrollment is "overwhelmingly low-income Latino," the union felt...