Rick,
I have not heard of SUR-13 either and so I can't provide any info. We have, however, run two articles on the notorious La Mara Salvatrucha, also known as MS-13 (August 2005 and March 2006 issues).
The gang started in El Salvador with many of them being members of the guerilla group Frente Farabundo Martí Para La Liberación (FMLN). Predominant “colors” are blue and white and members usually have numerous tattoos. I can't begin to distill all the info from two in-depth articles here, but suffice to say that these are very bad folks.
Denny
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