"agent"

means any person who is or has been or is reasonably suspected of being or having been directly or indirectly used by or in the name of or on behalf of any foreign State or any hostile organization for the purpose of committing in the Republic or elsewhere an act prejudicial to the security or interests of the Republic, or who has or is reasonably suspected of having committed or attempted to commit such an act in the Republic or elsewhere in the interests of any foreign State or any hostile organization;