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. Skripov had been refining Kay Marshall, an English-Australian woman as an agent for Soviet intelligence; however, she was in fact an agent of ASIO. In April 1983, ASIO uncovered more Soviet attempts at espionage and Valery Ivanov, who also held the post of First Secretary at the Soviet Embassy, was declared persona non-grata. He was ejected from Australia on the grounds that he had performed duties in violation of his diplomatic status. Penetration by the KGB These successes were marred, however, by the penetration of ASIO by a KGB mole in the 1970s. Due to the close defence and intelligence ties between Australia and the United States, ASIO became a backdoor to American intelligence. Upon realising ASIO was compromised, the United States pulled back on the information it shared with Australia. Following a strenuous internal audit and a joint Federal Police investigation, George Sadil was accused of being the mole. Sadil had been a Russian interpreter with ASIO for some 25 years and highly classified documents were discovered in his place of residence. Federal Police arrested Sadil in June 1993 and charged him under the Crimes Act 1914 with several espionage and official secrets related offences. However, parts of the case against him collapsed the following year. Sadil was committed to trial in March 1994, but the Director of Public Prosecutions decided not to proceed with the more serious espionage-related charges after reviewing the evidence against him. Sadil's profile did not match that of the mole and investigators were unable to establish any kind of money trail between him and the KGB. Sadil pleaded guilty in December 1994 to thirteen charges of removing ASIO documents contrary to his duty, and was sentenced to three months imprisonment. He was subsequently released on a 12-month good behaviour bond. It is believed that another ASIO officer, now retired, is suspected of being the mole but no prosecution attempts have been made. In November 2004, former KGB Major-General Oleg Kalugin confirmed to the Australian Broadcasting Corporation's Four Corners programme that the KGB had in fact infiltrated ASIO in the late 1970s and early 1980s. ASIO acknowledged in October 2016 that it had been infiltrated. Sydney 2000 Olympic Games ASIO began planning for the