Sub section (2) states that the rules made may provide for and many empower any authority to make orders providing for all or any of the following matters, namely: "(15) notwithstanding anything in any other law for the time being in force. . . . (i) the apprehension and detention in custody of any person whom the authority empowered. . suspects, on grounds appearing to that authority to be reasonable . . . . acting, being about to act or being likely to act in a manner prejudicial to the defence of India and civil defence, the security of the State, the public safety or interest,the maintenance of public order. . or with respect to whom that authority is satisfied that his apprehension and detention are necessary for the purpose of preventing him from acting in any such prejudicial manner." 211 Rule 30(1)(b) is in these terms: "The Central Government. . . if it is satisfied with respect to any particular person that with a view to preventing him from acting in any manner prejudicial to the defence of India and civil defence, the public safety, the maintenance of public order. . . may make an order (b) directing that he be detained.