"the way certain groups of people act may incline other groups to perceive"
Evidently a large, uncontrolled, influx of people forced to live at the margins of the society will increase crime and other bad behaviours - it has nothing to to with race.
For the matter we have here criminal gangs made by "caucasic" eastern europe immigrants, "latino" ones from South America, and "african" ones. Plus "local" ones, of course - which are also more from some specific zones than others.
Some of them came with crime already in mind, others are involved later, others are never involved and just look for a job, and are often exploited (to keep wages low as well....)
Still, racism is far stronger against people with more different ethnic characteristics, especially African people.