A helpful column from a year ago on Latino-black tension, especially in Los Angeles:
Although some commentators have attributed the Latino hostility to African Americans to the stress of competition in the job market, a 1996 sociological study of racial group competition suggests otherwise. In a study of 477 Latinos from the 1992 Los Angeles County Social Survey, professors Lawrence Bobo, then of Harvard, and Vincent Hutchings of the University of Michigan found that underlying prejudices and existing animosities contribute to the perception that African Americans pose an economic threat not the other way around.
It is certainly true that the acrimony between African Americans and Latinos cannot be resolved until both sides address their own unconscious biases about one another. But it would be a mistake to ignore the Latino side of the equation as some observers have done particularly now, when the recent violence in Los Angeles has involved Latinos targeting peaceful African American citizens.