Illegal Migrants (Determination by Tribunals) Act, 1983

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The Illegal Migrants (Determination by Tribunals) (IMDT) Act was an Act of the Parliament of India enacted in 1983 by the Indira Gandhi government. It was struck down by the Supreme Court of India in 2005 in Sarbananda Sonowal v. Union of India.

The IMDT Act described the procedures to detect illegal immigrants (from Bangladesh) and expel them from Assam. The Act was pushed through mainly on the grounds that it provided special protections against undue harassment to the “minorities” affected by the Assam Agitation. It was applicable to the state of Assam only whereas in other states, detection of foreigners is done under The Foreigners Act, 1946.

The act made it difficult to deport illegal immigrants from Assam.