Immunity is offered to people so that they might help in the prosecution of a higher-ranking level of criminal. This practice comes into play in cases where a drug dealer might implicate their supplier for immunity.
Rarely, a country might grant a person immunity from their crimes if it seems that they might be able to help out in one way or another. This was often done following World War II. Here are 10 people who committed monstrous acts but were granted immunity by one nation or another.