In the mid-1970s, Napolitano was invited by the Massachusetts Institute of Technology to give a lecture, but the United States ambassador to Italy, John A. Volpe, refused to grant Napolitano a visa on account of his membership of the PCI. Between 1977 and 1981 Napolitano had some secret meetings with the United States ambassador Richard Gardner, at a time when the PCI was seeking contact with the US administration, in the context of its definitive break with its past relationship with the Communist Party of the Soviet Union and the beginning of eurocommunism, the attempt to develop a theory and practice more adapted to the democratic countries of Western Europe. He was an active member of the party until it ended in 1991. In 2006, when Napolitano was elected President of the Italian Republic, Gardner stated to AP Television News that he considered Napolitano "a real statesman", "a true believer in democracy" and "a friend of the United States will carry out his office with impartiality and fairness".