The FBI classifies a "mass shooting" as four or more killed, not counting the perpetrator.  This article, dated 4/15/17, puts the tally for 2017 at 91 events, right about one a day.

https://www.dailydot.com/layer8/mass-shootings-2017/

This happend last week, May 29.  I don't see a mention of gang issues.  More likely a domestic dispute.

http://www.cnn.com/2017/05/28/us/mississippi-mass-shooting/index.html

Barak Obama was a State Senator, a U.S. Senator, then President.  He was never in an office responible for the workings of the city of Chicago.  Please elaborate what he did to create a "cr*phole".  By the way, Chicago isn't even in the top 5 with the highest murder rate.  Number one would be in Conservative Missouri, St. Louis to be exact.

https://www.thetrace.org/2017/01/chicago-not-most-dangerous-city-america/