Abstract: The article contains criminological characteristics of the crimes of foreign migrants, and specific features of its territorial spread. One should evaluate crimes committed by foreigners objectively without overestimating its public danger. Criminal activities level of foreigners is not above the criminal activities level of the Russian Federation according to the calculations by the authors. However, there is a number of other important parameters, showing high level of its public danger. Crimes by foreigners are closely connected with illegal migration. The threat to national security from illegal migration is strongly connected with the crimes of illegal migrants. The public danger of crimes by illegal migrants should not be underestimated. Illegal migrants constitute up to 90% among migrant criminals. There is also a connection between migrant crimes and citizenship of migrants. There is also a connection between migrant crimes and emigration directions from the neighboring states, and existence of old and new diasporas of people from these states in the Russian Federation. The new diasporas are formed by the migrant from the Central Asia. Their crime level grew abruptly in last five years (2007 to 2011). The older diasporas are formed by the citizens of other neighboring states, and the crime level among them is lowering.