Section 2(1)(xvii) in The Essential Services Maintenance Act, 1981
(xvii)any other service connected with matters with respect to which Parliament has power to make laws and which the Central Government being of opinion that strikes therein would prejudicially affect the maintenance of any public utility service, the public safety or the maintenance of supplies and services necessary for the life of the community or would result in the infliction of grave hardship on the community, may, by notification in the Official Gazette, declare to be an essential service for the purposes of this Act;