From Breitbart:

. . . he [Jackson] did speak to the inmates at Cook County Jail with his annual Christmas day sermon, and in it he urged the criminals to help get guns off the streets, as he is a strong supporter of gun control and an assault weapons ban.

He’s preaching to the choir. Criminals are in full favor of gun control since that leaves them with more unarmed victims. And, I’m sure they will help disarm citizens; they’ll steal as many guns from law abiding folks as they can.