In Chicago, there are roughly 13,000 police officers. But Fitzgerald estimates that there are 70,000-to-100,000 gang members in the city.
Fitzgerald had this message to people living in neighborhoods affected by gang violence:
"We think that overall, over the last five years or so, the violence rate has come down and we can't walk away from that. But it's going to take law enforcement working with community groups. And it's going to take responsibility of families to all work together on this. There is no single silver bullet," Fitzgerald said.
Fitzgerald urged people with information on gangs and violence in their communities to come forward and speak to police.