On 5 December 1995, Solana became the new Secretary-General of NATO, replacing Willy Claes who had been forced to resign in a corruption scandal. His appointment created controversy as, in the past, he had been an opponent of NATO. He had written a pamphlet called "50 Reasons to say no to NATO", and had been on a US subversives list. On 30 May 1982 Spain joined NATO. When PSOE came to power later that year, Solana and the party changed their previous anti-NATO positions into an atlanticist, pro-NATO stance. On 12 March 1986 Spain held a referendum on whether to remain in NATO, with the government and Solana successfully campaigning in favour. When criticised about his anti-NATO past, Solana argued that he was happy to be its representative as it had become disassociated from its Cold War origins.