In 1991, the Russian journalist Alexander Evlakhov, citing documents from the
Communist Party of the Soviet Union, stated that Cossutta had received
$824,000 million from Russia for propaganda reasons during the 1980s. Cossutta dismissed these claims, saying that he had never received money from the Soviet Union. In 1999, Cossutta appeared on a list of alleged Italian
KGB spies. In 2000, he sued
Silvio Berlusconi, the then
prime minister of Italy, for slander and defamation, asking for
₤100 billion in compensation. In a
Porta a Porta broadcast, he had stated that "Cossutta managed armed gangs in the post-war years and had continued until a few years ago to keep an armed organization in Italy." He later retired the lawsuit after Berlusconi issued a statement of retraction and apology. A parliamentary commission to investigate the allegations, among others, was instituted in 2002. Although it was led by the
centre-right coalition majority, which instrumentalized it and used the contents of the
Mitrokhin Archive, a collection of handwritten notes, primary sources, and official documents that were secretly made, smuggled, and hidden by the KGB archivist
Vasili Mitrokhin, to attack its political opponents and delayed the final report, it was sceptical or dismissive of the claims; criticized as politically motivated, as it was focused mainly on allegations against opposition figures, it was shut down in 2006 without having developed any new concrete evidence beyond the original information in the Mitrokhin Archive. A subsequent parliamentary commission, this time led by the
centre-left coalition, was established in 2006 to determinate whether the allegations were politically motivated. The 2006 parliamentary commission concluded: "Considering the British precautions that have been analyzed above, and which led to the elimination of many surnames and to making many events indecipherable and many characters unrecognizable, one can only speak, in the case of Cossutta – so clearly identified and accused, and moreover without the use of documents from the Mitrokhin Archive but on the basis of documentation, however distorted, of journalistic origin – of authentic persistence." The main sources of the allegations were Evlakhov, Mitrokhin and
Christopher Andrew, and Stephen Hellman, who based his claims on Evlakhov (who said that he never had the documents he was referring to but that he had seen them) and supported Occhetto's turn in 1989 and opposed Cossutta. According to the 2006 commission, the case of Cossutta was different from others because it was alleged that
SISMI, Italy's secret service, engaged in a cover up; in fact, SISMI delivered news articles making the allegations to the British secret services, who were in the process of writing a book about it. All these newspapers, from
Avanti!,
La Padania, and
Il Giornale, to
Il Giorno and
Il Tempo, were opposed to Cossutta and the centre-left government. In addition, there were many changes between the draft and Hellman's book, and in the footnotes, regarding Cossutta, who was variously referred to as "the Soviet loyalist on the Directorate" and "a KGB informant on the Directorate". Especially during the years of the First Italian Republic, Cossutta had been accused of being a "confidential contact of the KGB" in Italy. Despite the conclusions of the 2002 and 2006 parliamentary commissions (
Mitrokhin Commission), these allegations continued to be reiterated by some media even after his death.
Il Tempo called him a "man of the KGB", and wrote that he traveled "frequently to the USSR to develop strategies against the deviationist drift" of Berlinguer. In November 2009, Cossutta was awarded €30,000 for moral damages as a result of the defamatory content of an article by , the founder of , in which it was alleged that he was involved in the 1973 attempt on Berlinguer's life. In January 2015, the publisher of
Libero in the legal entity Editoriale Libero s.r.l., the director
Maurizio Belpietro, and the author of the 2003 article were definitively sentenced by Italy's
Supreme Court of Cassation to compensate Cossutta to €50,000 for moral damages as a result of the defamatory content of an article in which the newspaper, == Personal life and death ==