I have read news reports where they are trying to do just that - however much of their operation is in Latin America.
I have also seen news reports where MS-13 may be engaged in helping to smuggle would be terrorists and explosives across our southern border for a large fee
A Discussion on FREEREPUBLIC.com regarding a WashingtonTimes.com article: "MEXICAN MERCENARIES EXPAND BASE INTO U.S." (ARTICLE SNIPPET: "The deserters, known as the "Zetas," trained in the United States as an elite force of anti-drug commandos, but have since signed on as mercenaries for Mexican narcotics traffickers and have recruited an army of followers, many of whom are believed to be operating in Texas, Arizona, California and Florida.") (August 1, 2005) (Read More...)
TEAM4NEWS.com: Hidalgo - "MEMO WARNS OF MS 13 PLANS TO KILL POLICE OFFICERS" by Ray Pdraza (ARTICLE SNIPPET: "In the intelligence bulletin obtained by Action 4 News, a confidential informant in Virginia claims the Mara Salvatruchas have designated October 30 as 'Kill A Law Enforcement Officer Day'.") (October 8, 2005)
An Ongoing Discussion and Links on FREEREPUBLIC.com: "THUNDER ON THE BORDER -- (MINUTEMAN PROJECT) (Read More...)