13. Parliament shall, subject to and under the provisions of this Constitution, have power to make laws-
(a) for the peace, order and good government of the Commonwealth in relation to all matters not coming in the classes of subjects by this Act assigned to the legislatures of provinces;
(b) for the nationals and servants of the Commonwealth within other parts of India as well as those without and beyond India;
(c) for the government officers, soldiers, airmen and followers in His Majesty’s Indian forces, wherever they are serving, in so far as they are not subject to the Army Act or the Air Force Act, and
(d) for all persons employed or serving in or belonging to the Royal Indian Marine Service or the Indian Navy. For greater certainty, but not so as to restrict the generality of the foregoing terms of this section, it is hereby declared that notwithstanding anything in this Act the legislative authority of the Parliament of the Commonwealth extends to all matters coming within the classes of subject hereinafter enumerated and specified in Schedule I attached hereto.