The classes set out are these : (1) If the Secretary of State has reasonable cause to believe any person to be of hostile origin or associa tions, (2) if the Secretary of State has reasonable cause to believe any person to have been recently concerned in acts prejudicial to the public safety or the defence of the realm or in the preparation or instigation of such acts, (3) if the Secretary of State has reasonable cause to believe any person to have been or to be a member of, or to have been or to be active in the furtherance of the objects of, any such organization as is hereinafter mentioned . (a) the organization is subject to foreign influence or control, (b) the persons in control of the organization have or have had associations with, persons concerned in the government of, or sympathies with the system of government of, any Power with which His Majesty is at war, and in either case there is danger of the utilization of the organization for pur poses prejudicial to the public safety, etc., (4) if the Secretary of State has reasonable cause to believe that the recent conduct of any person for the time being in an area or any words recently written or spoken by such a person expressing sympathy with the enemy, indicates or indicate that person is likely to assist the enemy.