Good point. Start with Chicago. Surround certain neighborhoods without announcement and start confiscating illegal weapons. It will take trucks to take them out.
This is just as evil as taking weapons from anyone else. We have an enumerated constitutional right to keep and bear arms. Yes, that includes the Chicago thugs. As long as they keep it in their pants, I have no problem with them owning a gun. The second they kill somebody other than in self-defense, they are a murderer, and they need to be locked up or executed.
We must be very careful who we are willing to take rights away from. We may turn around one day and find it's OUR rights being taken, and there's nobody left to defend us.