[abb]

http://www.suntimes.com/5842015-417/garry-mccarthy-officers-seek-to-break-up-flash-mobs-before-they-form.html
Garry McCarthy: Officers seek to break up flash mobs before they form

http://www.wbez.org/story/new-top-cop-takes-office-lets-get-work-87622#
New top cop takes office: ‘Let’s get to work’

[abb]

http://www.suntimes.com/news/foster/5816335-417/flash-mobs-or-flash-thugs-have-plagued-south-side.html
Flash mobs or flash thugs have plagued South Side

http://abclocal.go.com/wls/story?section=news/politics&id=8178826
Mob attacks pose first challenge for Rahm, McCarthy

http://www.nbcchicago.com/blogs/ward-room/McCarthy-Commites-Undercovers-to-Downtown-123493424.html
McCarthy Commits Undercovers to Downtown Attacks