Becky Ringstrom was heading home after following federal immigration officers in her gray Kia SUV in suburban Minneapolis when she was suddenly boxed in by unmarked vehicles. At least a half-dozen masked agents jumped out to arrest her, one knocking on her windshield with a metal object as if threatening to use it to break her window.

After the arrest, captured on bystander video, the 42-year-old mother of seven later said she was transported to Bishop Henry Whipple Federal Building in Minneapolis where an officer gave her a citation charging her under a federal law that criminalizes impeding law enforcement.

The official said her name and photo would be added to a government database. The arrest of Ringstrom became the latest detention of one of thousands of local activists for violating Title 18, Section 111 of the U.S. Code, a catch-all charge for anyone who ¡°forcibly assaults, resists, opposes, impedes, intimidates, or interferes¡± with a federal officer conducting official duties. The statute can be charged as a felony or misdemeanor. As a felony, it carries up to 20 years in prison, but penalties beyond eight years are reserved for people who use ¡°a deadly or dangerous weapon¡± or cause ?an injury.