Denotified tribes are the tribes that were originally listed under the Criminal Tribes Act in 1871, as "addicted to the systematic commission of non-bailable offences." Once a tribe became "notified" as criminal, all its members were required to register with the local magistrate, failing which they would be charged with a crime under the Indian Penal Code. The Criminal Tribes Act of 1952 repealed the notification, i.e. ‘de-notified’ - the tribal communities. This act, was however replaced by a series of Habitual Offenders Acts, that asked police to investigate a suspect’s criminal tendencies and whether his occupation is "conducive to settled way of life." The denotified tribes were reclassified as habitual offenders in 1959. Indian Penal Code (IPC) provides a penal code for all of India excluding Jammu and Kashmir. ... 1959 (MCMLIX) was a common year starting on Thursday of the Gregorian calendar. ...
References
Denotified and Nomadic Tribes
http://films.shashwati.com/denotified-tribes/
Branded by Law : Looking at India’s Denotified Tribes/Dilip D’Souza.
The Bhamta Settlement in Baramati was established by the British as a reformatory settlement for criminal tribes.
Crooke (1896) describes them as a tribe whose primary occupation is, or rather used to be that of grain carriers and suppliers for armies in the battlefield.
Vyas, N.N. 'The Banjara: The Mercantile Nomads of Rajasthan', Tribe, 3 (2).