Article 305 of Indian Constitution: Saving of existing laws and laws providing for State monopolies.
Article 305 – Constitution Of India
Nothing in articles 301 and 303 shall affect the provisions of any existing law except in so far as the President may by order otherwise direct; and nothing in article 301 shall affect the operation of any law made before the commencement of the Constitution (Fourth Amendment) Act, 1955, in so far as it relates to, or prevent Parliament or the Legislature of a State from making any law relating to, any such matter as is referred to in subclause (ii) of clause (6) of article 19.]