I have read about that, and saw some news clips. Perhaps some of the "unintended" violence playing out over there in Iraq could be from these blood thirsty gangs. And they pose a danger to the American police forces when they return, as they are well trained, and often well armed.
This could become a REAL problem in the future and our police forces are actively looking at ways to curtail them.

Throw them into Guantanamo I say, get them out of our country and off our streets. Mexican gangs are starting to be a problem in certain areas. That's why big city living doesn't appeal to me. When a major disaster occurs, they'll simply walk in and take everything they need from a frightened citizenship.