The Mara Salvatrucha gang is a Salvadoran and central American gang from Los Angeles. Mara Salvatrucha is commonly translated as Salvadoran Army Ant. They are spreading out all over the US and they're ruthless and brutal. These guys are badass and most of them are tattooed all over with some intense work. I'm doing research on the gang for a book about gang tattoos. If anybody reading this has any photos to contribute or has any info on the meaning behind the tattoos you can post them here or email them to me at ms131313 (at) yahoo.com - send or post any photo credits.
Here's some photos I've found on the internet:
this is some insane facial work on this guy

this guy has the typical MS on his forehead and the devil horns. he's got two black teardrops that usually mean he's killed somebody, also a spiderweb on his shoulder that usually is an aryan symbol on the elbow.

I'll post some more, but if anybody can turn me on to more pics and the meanings, I'd be thankful.