After Kim Philby's flight from Beirut to Moscow in 1963, rumours began to circulate that Hollis had alerted him to his impending arrest. Hollis was criticised for not alerting John Profumo, the War Secretary in Prime Minister Harold Macmillan's Conservative government, that he might have become entangled with a Soviet spy ring through his friendship with Stephen Ward and his affair with showgirl Christine Keeler, who was introduced by Ward to Profumo. Soviet Naval Attache Eugene Ivanov was also involved with Keeler at this time, in the early 1960s, and sought to learn the date of American plans to arm nuclear warheads in West Germany, from Profumo through Keeler. Profumo had to resign in mid-1963, and the resulting scandal did much to bring the Labour Party to power in the October 1964 General Election.