There seems to have been no evidence that Liversidge had "hostile associations" or had committed "acts prejudicial" to public safety. However, on 15 May the Secretary of State for Air, Sir Archibald Sinclair, wrote to the Home Office recommending that Liversidge be interned because "I am certain that you will agree that it is most undesirable that a man with the unsavoury and indeed dangerous associations of Perlsweig, who during recent months has had access to information of a most secret character, should be left at large either in the Service or in the Country."