A Mexican immigrant whose skull was broken during his arrest by immigration officers last month in Minnesota says the beating was unprovoked.

For many immigrant families in Minnesota, sending a child to school each day requires faith that one of the thousands of federal immigration officers deployed around the state won’t detain them.

As more than 2,000 federal agents surge in Minneapolis in an immigration crackdown and clash with protesters on the streets, countless residents are also quietly resisting the operation through grassr...