Here are some more sources for ya.
Immigration law enforcement has been a key ingredient contributing to the success of criminal gang suppression efforts in many jurisdictions across the United States. Since 2005, the Bureau of Immigration and Customs Enforcement (ICE) has arrested more than 8,000 gangsters from more than 700 different gangs as part of a special initiative known as Operation Community Shield. This effort has produced incalculable public safety benefits for American communities, despite being criticized periodically by immigrant and civil liberties advocates that are consistently opposed to all immigration law enforcement.
Local governments and law enforcement agencies that shun involvement in immigration law enforcement are missing an opportunity to protect their communities from criminal immigrant gang activity. Policymakers should take further steps to institutionalize partnerships between state and local law enforcement agencies and ICE in order to address gang and other crime problems with a connection to immigration.
Immigrant gangs
1 are considered a unique public safety threat due to their members’ propensity for violence and their involvement in transnational crime. The latest national gang threat assessment noted that Hispanic gang membership has been growing, especially in the Northeast and the South, and that areas with new immigrant populations are especially vulnerable to gang activity.
2 A large share of the immigrant gangsters in the most notorious gangs such as Mara Salvatrucha (MS-13), Surenos-13, and 18th Street are illegal aliens. Their illegal status means they are especially vulnerable to law enforcement, and local authorities should take advantage of the immigration tools available in order to disrupt criminal gang activity, remove gang members from American communities, and deter their return. Once explained, these measures find much support, especially in immigrant communities where gang crime is rampant.
Taking Back the Streets: ICE and Local Law Enforcement Target Immigrant Gangs | Center for Immigration Studies
Gang follows illegal aliens - Washington Times
Illegal Immigrant Gangs Commit Most U.S. Crime | Judicial Watch