Ultimately, Petrov was accused by the Soviet Ambassador of several lapses in judgement that would have led to his imprisonment and probable execution upon his return to the Soviet Union. Petrov feared for his life and accepted the defection life-line provided by ASIO. The actual defection occurred on 3 April 1954. Petrov was spirited to a safe house by ASIO officers, but his disappearance and the seeming reluctance of Australian authorities to search for him made the Soviets increasingly suspicious. Fearing a defection by Petrov, MVD officers dramatically escorted his wife Evdokia to a waiting aeroplane in Sydney. There was doubt as to whether she was leaving by choice or through coercion and so Australian authorities initially did not act to prevent her being bundled into the plane. However, ASIO was in communication with the pilot and learned through relayed conversations with a flight attendant that if Evdokia spoke to her husband she might consider seeking asylum in Australia. An opportunity to allow her to speak with her husband came when the Director-General of Security, Charles Spry, was informed that the MVD agents had broken Australian law by carrying firearms on an airliner in Australian airspace and so could be detained. When the aeroplane landed in Darwin for refuelling, the Soviet party and other passengers were asked to leave the plane. Police, acting on ASIO orders, quickly disarmed and restrained the two MVD officers and Evdokia was taken into the terminal to speak to her husband via telephone. After speaking to him, she became convinced he was alive and speaking freely and asked the Administrator of the Northern Territory for political asylum. The affair sparked controversy in Australia when circumstantial links were noted between the leader of the Australian Labor Party and the Communist Party of Australia (and hence to the Soviet spy ring). H.V. Evatt, the leader of the Labor Party at the time, accused Prime Minister Robert Menzies of arranging the Petrov defection to discredit him. The accusations lead to a disastrous split in the Labor party. Petrov was able to provide information on the structure of the Soviet intelligence apparatus in the mid-1950s, information that was highly valuable to the United States. It was by obtaining this information that the Organisation's reputation in the eyes of the United States was greatly enhanced. In fact, when Brigadier Spry retired, the Deputy Director of the CIA sent the following tribute:  ASIO's counter-intelligence successes continued throughout the Cold War. Following an elaborate investigation between 1961 and 1963, ASIO recommended the ejection of the First Secretary of the Soviet Embassy, Ivan Skripov, and his declaration as "persona non grata".