21st century is said to be the century of migration. Owing to the newest technologies people migrate easier and quicker. They also decide to change their place of residence more often – now not only within their countries but also outside it. Greater European integration and resulting increased facility in travelling within the EU facilitate this process. Yet, the most important cause of migration is the drive to improve living conditions. This is the main reason why foreigners from across the globe come to Europe – better life for them and their families. At present in the old EU countries migrants already constitute ten percent of society or even considerably more (according to UN data 14.1% in Spain, 13.1% in Germany, 10.7% in France, 10.4% in the UK), while in Poland this percentage is only 2.2% (although according to more credible OECD data, in 2008 it was as little as 0.2%). The number of foreigners legally residing in Poland permanently in 2009 was 92,500 (Office for Foreigners data), and the number of foreigners legally working in the country was almost 175,000 (Ministry of Labour and Social Policy data). One should also take into account a considerable number of foreigners residing in Poland illegally, estimated by researchers to be between 50 and 450 thousand. Moreover, the Border Guard data show an increase in the number of visitors to Poland – in 2009 7,2 million foreigners crossed Polish borders (which is a 5% increase compared to 2008). However, there are also threats related to migrations and they are of interest to sociologists and criminologists. Foreigners often remain on the margin of society and, as it happens in all marginalised social groups, some of them can turn to crime. Criminal activity of foreigners can be diverse, majority of it being common crimes committed against other foreigners. Organised crime crossing national borders is also a problem, particularly its most dangerous variety, human trafficking. Migrations involve also a clash of cultures which can lead to many previously unknown crimes (like e.g. honour murders, juvenile marriages, or reappearance of vendetta murders). Foreigners as “aliens” in the society often evoke fears, one of them being fear of serious crime – 2008 opinion poll by CBOS indicated that over 90% of Poles are afraid of such treat from foreigners. Yet fear of immigrants has much more in common with unrest and social instability brought by immigrant to the lives of residents than with actual risk of crime. It is worth to recall that one of first criminological studies carried out already in 1920s by Clifford Shaw indicated that crime is related to environment people live in, not to their race or nationality. Looking at the statistics, one may have an impression that [in Poland] there is no problem with foreign delinquency. Suspected foreigners in the peak moment in 2001 constituted 1.3% of all offenders and in 2008 only 0.41%.