Daily Beast story about "black on black crime". It took 6 weeks to get the police to event think about bringing charges against zimmerman. Also talks about one un/under reported case Darryl Green. I recall they had done a petition on change.org as well.
http://www.thedailybeast.com/articl...ing-and-the-myth-of-black-on-black-crime.html
I know folx won't read this, but I'll drop it here anyway.
http://www.justicepolicy.org/uploads/justicepolicy/documents/off_balance.pdf
From 2008: anti-violence march, drew 20,000 folx. I didn't hear it reported:
http://mirroronamerica.blogspot.com/2008/06/st-louis-black-men-march-against.html
This was posted in 2011, not sure exactly when it took place, if it's the one above or not:
Anti gun rally in Harlem 2013:
http://amsterdamnews.com/news/2013/aug/12/public-will-come-out-promote-anti-gun-violence-and/
There was a news story around the time of the Trayvon coverage that mentioned 4-5 protests seeking justice for black folx who were killed that just couldn't get traction in the media because it was not interracial crime. I tried to find them but couldn't. I did come across a response to a question similar to yours that was posed:
Black folx get shut down at the local level when it comes to stuff like this. When children are missing and white, they were abducted. When they are missing and black, they are runaways. When we get killed, it was somehow "deserved", as we are all assumed to be criminal in some aspect anyway. Even the folx who are savvy enough to pull a protest or march together do not get the coverage. There are local movements, we just don't hear about them.