Willem Adriaan Bonger (Dutch criminologist) classifies crimes into four main types depending upon their purpose:
(1) Financially crime (Theft, fraud, Forgery etc.)
(2) Political crime (Espionage , treason etc.)
(3) Sexual crime (Rapes, homosexuality etc.)
(4) Technological crime (Cyber crime)
(5) Miscellaneous crimes (Crimes other than the above three types e.g. quarrels, fights, kidnapping or addiction to narcotics etc.)