I SAY AGAIN, what did Muhammad Atta have to do with Mexico?
Your question should have been:
"What is the connection MS-13 gangs have with Islamic terrorist groups?"
If you can't trouble yourself to read those news stories; ( one by Tucson Channel 4 Eyewitness News, and the other by the Orange County District Attorney)
...Then I'm not going to waste my time trying to explain it to you.