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P2 became the target of considerable attention in the wake of the collapse of Banco Ambrosiano (one of Milan's principal banks, owned in part by the Vatican Bank), and the suspicious 1982 death of its president Roberto Calvi in London, initially ruled a suicide but later prosecuted as a murder.
It has also been suspected that P2 was involved in the 1980 Bologna massacre as part of the strategia della tensione followed by "stay-behind" secretNATO clandestine structure Gladio, which led to the opening of investigations, in the 1990s, by the Italian Chamber of Deputies.
Richard Brenneke: "The P2 was involved in the operation for which I ended up in court, that is the delay in the liberation of the American hostages in Iran in 1980" (known as "October surprise").