2(1), (3), (4), (5), (8) and (10) defines the expres sions "agency", "employer", "establishment", "facto ry", "principal employer" and "Security Guard" as follows: " "agency", or "agent", in relation to a Security Guard, 26 means an individual or body of individuals or a body Corporate, who undertakes to execute any security work or watch and ward work for any factory or establishment by engaging such Security Guard on hire or otherwise, or who supplies such Security Guards either in groups or as an individual, and includes a sub agency or a sub agent; "employer", in relation to a Security Guard engaged by or through an agency or agent, means the principal employer, and in relation to any other Security Guard, the person who has ultimate control over the affairs of the factory or establishment and includes any other person to whom the affairs of such factory or establishment are entrusted, wheth er such person is called an Agent, Manager or by any other name prevailing in the factory or establishment; "establishment" means an establishment as defined in clause (8) of section 2 of the Bombay Shops and Establishments Act, 1948; "factory" means a factory as defined in clause (m) of section 2 of the ; "principal employer" means an employer who has engaged Security Guards through an agency or agent; "Security Guard" or "private Security Guard" means a person who is engaged or is to be engaged through any agency or an agent, wheth er for wages or not, to do security work or watch and ward work in any factory or estab lishment and, includes any person, not em ployed by any employer or agency or agent, but working with the permission of, or under an agreement with, the employer or agency or agent, but does not include the members of any employer 's family or any person who is a direct and regular employee of the principal employer;" Section 3 empowers the State Government for the purposes of ensuring an adequate supply and full and proper utilisation of Security Guards in factories and establishments and generally for making better provisions in the terms and conditions of employment of such workers, to make one or more schemes to provide for the registration of emp 27 loyers and Security Guards in any factory or establishment and to provide for the terms and conditions of employment of registered Security Guards and to make provisions for the general welfare of such Security Guards.