Section 6
SEC. 6. The President of the Philippines on reasonable -notice to the grantee, may at any time change or cancel or modify in whole or in part any or all of the allotments of frequencies or wave-lengths hereunder as well as any license issued hereunder to use such frequencies or wave-lengths to or from any or all stations to and from which they may be used. He may take such action (a) whenever in his judgment suck frequencies and wave-lengths have been used or there is danger that they will be used by the grantee to impair electrical communication or stifle competition or to obtain a monopoly in electrical communication, or to secure unreasonable rates for such communication, or otherwise to violate the laws of public policy of the Philippines; (b) whenever in his judgment the public interest of the Philippines requires that such frequencies or wave-lengths should be used for other purposes than those of the grantee, either by the Commonwealth of the Philippines or by other individuals or corporations licensed by it; (c) whenever in his judgment for any reason the public interest of the Philippines so requires. The President of the Philippines is authorized to appoint, employ or make use of such boards, commissions, or agents , as in his discretion he may select, to investigate and determine the facts upon which he may act as aforesaid, and such boards, commissions and agents shall have the right by compulsory process of subpoena, to summon witnesses, administer oaths and take evidence.