Starting in 1945, the prosperity of the "long summer" economic boom that ended with the Arab oil shock of 1973-74 led to an enormous construction boom in Toronto. Most of the construction contractors in Toronto were immigrants from the "Mezzogiorno" (the south of Italy) while most of the construction workers were also Italian immigrants. In the "Mezzogiorno", paying off groups such as the Mafia and the 'Ndrangheta is seen as a normal business cost. Italian organized crime groups infiltrated and took over the Toronto construction industry in the 1960s. In 1974, a Royal Commission headed by Justice Harold Waisberg in its report examining the influence of organized crime in the Toronto construction industry stated that starting in 1968 "a sinister array of characters were introduced to this industry". A key moment occurred in May 1971 when Cesido Rommanilli, one of Toronto's largest construction contractors, agreed to hire Natale Luppino of Hamilton's Luppino crime family as his "escort" in exchange for which the Luppino family would intimidate Rommanilli's workers and take over their unions. Luppino then took over the unions, who were demanding wage increases that Rommanilli did not want to give them. At the same time, the Mafiosi Paul Volpe was hired by A. Gus Simone of Local 562 of the International Lathers Union to help "persuade" other construction unions to join the Lathers union. Accordingly, to Toronto police reports, between 1968 and 1972 at construction sites in Toronto there occurred 234 cases of major "willful damage", 23 cases of arson, 15 cases of mob-related assault, 5 explosions, and numerous cases of the theft of construction materials. Bruno Zanini, a journalist investigating Mafia influence in the construction industry was wounded in 1972 in an assassination attempt. In his report on 19 December 1974, Justice Waisberg concluded that the construction industry in Toronto had been taken over by the Mafia and a climate of fear reigned in the construction sites.