In the Indian context the term De-notified tribes’ refers to

Under British rule many communities—often nomadic craftsmen, traders and pastoralists—were officially branded as “criminal tribes” by the Criminal Tribes Act of 1871, on the assumption they were criminal by birth and were forced into notified settlements [1]. After independence the Act was repealed and those communities were formally “de-notified” (i.e., removed from the list of criminal tribes), a process associated with the 1952 repeal and subsequent legislation addressing habitual offenders; hence “de-notified tribes” denotes communities earlier classified as criminal tribes, not simply nomadic groups, aboriginals, or jhum cultivators.

Sources

1. [1] India and the Contemporary World - I. History-Class IX . NCERT(Revised ed 2025) > Chapter 5: Pastoralists in the Modern World > New words > p. 105