Committed with intent to destroy, in whole or part, a national, ethnical, racial, or religious group. The convention on the prevention and punishment of the crime of genocide. Acts directed against political groups are excluded from the de nition of genocide. Dierence between war crimes and crimes against humanity. One instance of a reprehensible act could be a war crime, but not a crime against humanity. The latter must be shown to have resulted from widespread and systematic policy. Also crimes against humanity (e. g. destruction of property and systematic persecution) can occur in any setting, while a war crime takes place only during a war. The objections most frequently raised against the convention on genocide include: The convention excludes targeted political and social groups. Proving intention beyond reasonable doubt is extremely dicult. The diculty of de ning or measuring in part , and establishing how many deaths equal genocide.