This ordinance provides for "the apprehension and detention in custody of any person whom the authority empowered by the rules to appre hend or detain as the case may be suspects, on grounds appearing to such authority to be reasonable, of being of hostile origin, or of having acted, acting, being about to act, or being likely to act in a manner prejudicial to the public safety or interest, the defence of British India, the maintenance of public order, His Majesty 's relations with foreign powers or Indian States, the maintenance of peaceful conditions in tribal areas or the efficient prosecution of the war, or with respect to whom such authority is satisfied that his apprehension and detention are necessary for the purpose of preventing him from acting in any such prejudi cial manner, the prohibition of such person from entering or residing or remaining in any area, and the compelling of such person to reside and remain in any area, or to do or abstain from doing anything.