" Section 56 of the Act provides, to the extent material, that whenever it shall appear in Greater Bombay to the Commissioner (a) that the movements or acts of any person are causing or are calculated to cause alarm, danger or harm to person or property, or (b) that there are reasonable grounds for believing that such person is engaged or is about to be engaged in the commission 70 of an offence involving force or violence or an offence punishable under Chapter XII, XVI or XVII of the Indian Penal Code, and when in the opinion of such officer witnesses are not willing to come forward to give evidence in public against such person by reason of apprehension on their part as regards the safety of their person or property, the said officer may by order in writing direct such person to remove himself outside the area within the local limits of his jurisdiction or such area and any district or districts, or any part thereof contiguous thereto, within such time as the said officer may prescribe and not to enter or return to the said area from which he was directed to remove himself.