I have written a lot about the relationship between crime and immigration (e.g. on Texas and Arizona). The clear conclusion is that immigration does not increase crime, and may in fact reduce it. More evidence:
During precisely the period that California experienced the biggest immigrant population increase in its history, the state also experienced a precipitous drop in crime rates, according to a report by Barry Krisberg, a renowned criminologist at UC Berkeley's School of Law.Correlation is not necessarily causation, but evidence is really piling up.