Johannesburg - Forensic investigator Paul O'Sullivan acted like an organised crime boss and was being investigated for racketeering, the Kempton Park Magistrate's Court heard on Tuesday.This was according to Durban Hawks Colonel Amod Khalil Hoosen, the investigating officer in a SAA fraud case against O'Sullivan.He was testifying in O'Sullivan's trial on charges of violating the SA Citizenship Act. O'Sullivan had used his Irish passport to leave the country.Hoosen told the court that the SAA docket was before the director of public prosecutions who had decided to prosecute the matter, when the deputy president, senior police officers and media houses received an email from O'Sullivan. He threatened to "go into exile".Hoosen said O'Sullivan was viewed as a flight risk and a team of police officers, which had been put together by Gauteng Hawks head, General Prince Mokotedi, arrested him before he left the country. Hoosen said a number of police officers were investigating numerous cases against O'Sullivan.Hoosen told prosecutor Jabulani Mlotshwa that the head of the police detectives, Lieutenant-General Vinesh Moonoo, had asked him to interview the complainant in the SAA matter, Dudu Myeni, as she lived in KwaZulu-Natal. 'Innocent' communication interceptedREAD: O'Sullivan arrested to stop his Zuma graft claims - LawyerHe said he asked Moonoo why he should be the investigator as he normally dealt with clandestine narcotic laboratories. Moonoo said he needed someone who was independent who did not know O'Sullivan, to investigate the case.Mlotshwa asked Hoosen if he was aware O'Sullivan had made accusations against Moonoo. He said "yes", adding that Moonoo had told him there was innocent communication of his that O'Sullivan had intercepted.Hoosen said Moonoo told him he discovered police officers in crime intelligence had given the communication to O'Sullivan.Hoosen said one of the people Moonoo was supposed to have been talking to was a senior counsel in the Johannesburg bar, Nazeer Cassim, who O'Sullivan falsely said was a drug dealer. The other was a man by the name of Padayachee who "illegally lends money at the casinos".Hoosen said the communication in the intercepted calls was about setting a time to meet.Advocate Barry Roux, for O'Sullivan, told him the Cassim referred to was not the same man as the senior counsel.In cross-examination, Roux asked Hoosen to go over the email O'Sullivan had sent, indicating he would be giving a press conference in London. Roux said the content of the email was about corruption in the country and it was not true O'Sullivan said he was going into exile.Four lever arch files on O'SullivanHoosen disagreed. He read parts of the email to the court: "I will not be here. I will do what I have to do. If I have to go into exile to beat you then be it [sic]."Hoosen told the court that police had four lever arch files of information on dockets against O'Sullivan."People have come forward now," Hoosen said, saying he was an expert on how organised crime operated, and that O'Sullivan acted like an organised crime boss."People have come forward with extortion matters left, right and centre. I am making a suggestion to the DPP of a charge of racketeering. I have affidavits from attorneys even. He behaves like an organised crime boss, leaving the country under the radar and doing illegal surveillance on innocent people." The trial would continue on Wednesday, after Roux has attended the sentencing of another client, Oscar Pistorius, in the High Court in Pretoria.