Mary Catherine Roper, a staff attorney at the American Civil Liberties Union of Pennsylvania's Philadelphia office, said that the cases seem "pretty outrageous."
"This idea of taking people's guns who are carrying them legally and arresting them is absurd," she said. "The police don't get to decide what is a crime - they only get to enforce what is a crime.
"They are simply acting as vigilantes here and deciding they know better than the law."
Roper said that citizens should remain wary of police who arrest people complying with the law and take their property, even if it is a gun.
"The public may be saying, 'You're getting guns off the street,' " Roper said.
"But there's got to come a point where you want your police, of all people, to respect the law.
"This isn't technical, it's fundamental."
Conservatives like to treat the ACLU as if its a lefty special-interest group. Me? I just think it's an organization trying to protect our rights. I'm glad it's there. Maybe conservatives should be, too.