The tenth schedule to the Indian constitution that is popularly referred to as the Anti-Defection Law’ was inserted by the 52nd Amendment of the Constitution in 1985.
Disqualification on ground of defection.—
(1) Subject to the provisions of 3 [paragraphs 4 and 5], a member of a House belonging to any political party shall be disqualified for being a member of the House—
(a) if he has voluntarily given up his membership of such political party; or (b) if he votes or abstains from voting in such House contrary to any direction issued by the political party to which he belongs or by any person or authority authorized by it in this behalf, without obtaining, in either case, the prior permission of such political party, person or authority and such voting or abstention has not been condoned by such political party, person or authority within fifteen days from the date of such voting or abstention.