of Public Works. Between 1959 and 1963, about 80 percent of building permits were given to just five people, none of whom represented major construction firms; they were likely Mafia frontmen. Construction companies unconnected with the Mafia were forced to pay protection money. Many buildings were illegally constructed before the city's planning was finalized. Mafiosi scared off anyone who dared to question the illegal building. The result of this unregulated building was the demolition of many historic buildings and the erection of apartment blocks, many of which were not up to standard. During the 1950s, the Mafia continued their deep penetration of the construction and cement industries. The cement business was appealing because it allows high levels of local economic involvement and is a good front for illegitimate operations. First Mafia War The First Mafia War was the first high-profile conflict between Mafia clans in post-war Italy. (The Sicilian Mafia has a long history of violent rivalries.) In 1962, mafia boss Cesare Manzella organized a drug shipment to the United States with the help of two Sicilian clans, the Grecos and the La Barberas. Manzella entrusted another boss, Calcedonio Di Pisa, to handle the heroin. When the shipment arrived in the United States, however, the American buyers claimed that some heroin was missing, and paid Di Pisa a commensurately lower sum. Di Pisa accused the Americans of defrauding him, while the La Barberas accused Di Pisa of embezzling the missing heroin. The Sicilian Mafia Commission sided with Di Pisa, and the La Barberas were outraged. The La Barberas murdered Di Pisa and Manzella, triggering a war. Many non-mafiosi were killed in the crossfire. In April 1963, several bystanders were wounded during a shootout in Palermo. In May, Angelo La Barbera survived a murder attempt in Milan. In June, six military officers and a policeman in Ciaculli were killed while trying to dispose of a car bomb. These incidents provoked national outrage and a crackdown in which nearly 2,000 arrests were made. Mafia activity fell as clans disbanded and mafiosi went into hiding. The Sicilian Mafia Commission was dissolved; it did not re-form until 1969. A total of 117 suspects were tried in 1968, but most were acquitted or received light sentences. The inactivity, plus money lost to legal fees and so forth, reduced most mafiosi to poverty. The Mafia families in Palermo were particularly hit hard, and ceased activity altogether