RUDY GIULIANI: I think the president has very little knowledge of what causes crime or how you reduce crime. I mean, the reality is, gun control laws control the behavior of legitimate people. People who rob stores, people who rob banks, and people who are insane and want to go ahead and murder don't follow the gun control laws. You and I follow them. So it controls the behavior of people who can be regulated. Take New York and Chicago.  Chicago has 2.5 times the murders of New York.  Same gun control laws. Why? Because in New York, at least up until now, there was a much more aggressive stop-and-frisk policy. Which meant we took the guns.

[...]

GIULIANI: What's going to reduce crime is arresting people, stopping them, frisking them. You've got to take the guns away from the bad guys. 

Previously: 

Conservative Media Use Oregon Community College Shooting To Revive “Gun-Free Zone” Canard

Washington Post Debunks Fox Favorite Claim That Rolling Back Stop-And-Frisk Policies Increases Crime

O'Reilly Still Refuses To Face Facts About Stop-And-Frisk