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In page Social cleansing:

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The distinction between death squads and paramilitary groups and the National Police is not always clear. Not only are policemen often members of these groups, but these groups typically enjoy the protection of the police.[1] Other members include businessmen, industrialists, guerillas, and soldiers.[2] Death squads emerged in the late 1970s, one of the first being the Black Hand, a group that murdered suspected criminals.[1] Their reasoning behind these killings is the flawed legal system, which convicts less than 3% of criminals.[citation needed] Death squads and other groups believe it necessary to step in where the legal system has failed by eliminating these suspected criminals.[3] As of 1995, there were no less than 40 of these squads operating in Colombia.[4]