How strict gun control laws work in Chicago

“At least six people were killed and 27 others wounded in weekend gun violence across Chicago.”

http://www.nbcnews.com/id/52781472

“Gun violence.” What about knife violence or fist violence? Any big metal pipe violence?

The story does mention a couple of pistol whippings, but does not say whether those are considered “gun violence.”

“Gun violence” means a gun was a fault.