In Norway, the per-capita rate of violent robberies, burglaries and violent rape is overwhelmingly larger in immigrant populations than the native. But it's a bit taboo to discuss this in polite company.
Proving criminals are innocent victims of poverty and class is difficult unless you are of Marxist persuasion. Statistics related to immigration and crime are obscure, as definitions of crimes change and entire classes of statistics are forbidden to do for political reasons (e.g. tracking offender's race or religion)
However, one point of view is that it's the opposing viewpoint that must be proven. It's also hard to prove that being "immigrant" or "non-european" is causing you to be a criminal, unless you are a nationalist.
Personally, I'd say it's asking the wrong question. We want to reduce crime and poverty, and the question is how to do it. If it was easy to prevent poverty, it would be done already. And frankly, if Sweden hasn't prevented poverty "enough" when non-working immigrants are provided with food, clothes, housing, cable-TV and mobile phones, then when is it really prevented?
Example sources: http://sverigesradio.se/sida/gruppsida.aspx?programid=3615&g... http://www.svd.se/opinion/ledarsidan/brottslighet-bland-inva... http://www.advokatsamfundet.se/Advokaten/Tidningsnummer/2010... http://www.bgf.nu/faktabanken/kriminalitet/brabra2.html
and I'm not writing a dissertation in sociology here, unless you want to give me enough bitcoins :)