At the Stock & Barrel Gun Club’s two locations near Minneapolis, the classes for people seeking a permit to carry a firearm almost always draw large crowds. “It’s usually in the hundreds,” David Taylor, the club’s CEO, said. But since immigration enforcement agents flooded the city , sparking clashes in the streets and the killing of two protesters , interest in the classes has only grown. In just the past two weeks, Taylor said, his club has received four times the usual number of sign-ups.