In 1982, a Soviet Jew who immigrated to Israel after being granted an exit visa approached the Israeli security services and told them that the KGB had recruited him as a spy. Shin Bet subsequently ran him as a double agent, and through him, obtained strong circumstantial evidence that Klingberg was a Soviet spy. Despite this, the Shin Bet had not obtained solid evidence that would be admissible in court, and decided to elicit a confession out of him. In January 1983, Shin Bet officers informed Klingberg they wanted to send him to Singapore where a chemical plant allegedly blew up. After leaving home with his suitcase, he was taken not to the airport but to an apartment in some undisclosed location where he was interrogated harshly and put under psychological pressure to confess. After ten days, Klingberg admitted to being a Soviet mole and signed a confession. He claimed that he had provided information to the Soviet Union only for ideological reasons.