From this:

Two LSU researchers have published a study they said shows that Latino immigration and U.S. immigration policies have displaced blacks from low-skill labor markets, which in turn led to more violence in urban black communities.

The study by LSU Sociology Professor Edward Shihadeh and Ph.D. candidate Raymond Barranco, titled “Latino Employment and Black Violence: The Unintended Consequence of U.S. Immigration Policy,” was published in the March 2010 issue of Social Forces, LSU University relations said in a press release.

Bear in mind that the two researchers aren't on the right side as far the their proposed solutions are concerned. From their press release (link):

Before the United States/Mexico border was militarized, Latino immigration was a two-way trip; immigrants, mainly from Central America, moved to the United States temporarily to finance a project in their home country. But in response to U.S. public pressure, border security was intensified. Tall fences were built, cameras installed and the border was patrolled relentlessly by well-armed guards. As a result, Latino immigrants in the United States stopped returning home for fear that they could not repeat the trip. This increased the number of Latino workers in the United States competing for jobs in agriculture, manufacturing and construction. Blacks lost that competition in many cities, and where that occurred, murder rates went up.

"This is an unintended but significant result of immigration policies," said Shihadeh, lead author on the project. "This is not a blame game. We do not advocate restricting the flow of Latino migrants in either direction. This is what triggered the flow of events in the first place. There is no reason to deprive this country of the rich contributions made by Latinos. Our study simply describes how immigration policy opened a new chapter in the history of the U.S. labor market and how that harmed black communities."