What is crime?
Crime is the breach of rules or laws for which some governing authority (via mechanisms such as legal systems) can ultimately prescribe a conviction. Individual human societies may each define crime and crimes differently, in different localities (state, local, international), at different time stages of the so-called "crime" (planning, disclosure, supposedly crime”. A crime is therefore an act prohibited by law and punishable by law.

CRIME AND ETHNICITY What is ethnicity?
Ethnicity is socially defined category based on common language, religion and nationality, history or any other cultural factor. It can also be defined as a shared cultural heritage, typically involving common ancestors language and religion. Sociological insight into the patterns of ethnicity and crime may highlight things such as, demographic factors (age and socio-economic composition of ethnic communities), prejudice in the police force, links to colonial struggle and marginalization.
It is important to emphasize that none of these explanations adequately explain the complex patterns of ethnicity and crime, and also tend to overlook the amount of different experiences within each ethnic group (i.e. not all young back unemployed men turn to crime).
Due to societal prejudice and stereotyping some ethnic groups have come to be related with crime. For example, in Kenya, the Kikuyu community are judged as criminals. Other ethnic communities have come to believe that they are the only ones who commit crimes. This is not true as other communities also commit crimes, it has reached a point that people from other ethnic groups forge identity cards with kikuyu names; this justifies the stereotype. On the other hand, in Kenya most crime reports or analyses show that most criminals come from the stereotyped ethnic group, the Kikuyu.
Because prejudice is hard to change