Hi, Dora. If you are in Chicago, IL, USA, I found a bird-rescue website there.
From a cursory look, it appears they are new, but you might try them as a starting place. If nothing else, perhaps they can better direct you to find the help you need. The only other thing I can think of is that you might look in your phone book for anything related to bird rescue.
Hi Dora and a warm welcome to you from those of us on staff here at BirdForum.
Unfortunately, Pigeons don't seem to rate high on the ladder of rehab specialists. Sometimes a few calls to your local vets might prove fruitful for you. It has worked on a couple of occasions with me. Good luck and keep us posted.