Pinkerton
this magistrate is credited with developing the concepts of preventing crime, instead of controlling it.
Cesare Beccaria
James smith
Clarification needed: do you mean help with committing the crime or help with preventing and solving crime?
Fighting crime - exceptional idea
Example sentence - He had no idea how long it would be before the crime was discovered.
No, a regular citizen is not obligated to 'stop' a crime in progress. However if you have knowledge of it and fail to report it you might have some legal liability.
Mike Hunt and Mike Hawk
John Dalton
They stole silkworms, murdering the Chinese who were guarding them. Marco Polo is generally credited with this crime.
Lewis Cass
He is credited with devising the idea of Christmas cards, introducing the first commercial card in 1843