Mandanici entered citywide politics for the first time in 1969, when he became Bridgeport city clerk. Mandanici "maintained an iron control of city politics until 1981, when he was narrowly defeated by Republican
Leonard S. Paoletta after scandal rocked his administration." Mandanici was never implicated At that time, eleven had pleaded guilty, three were convicted following jury trials, a judge dismissed charges against one, and four (including Mandanici's son John C. "Buddy" Mandanici) were awaiting trial. Judge
Robert C. Zampano sentenced Mandanci Jr. to a five-year suspended sentence, a $20,000 fine, and three years' probation. Mandanici Sr.'s "biggest antagonist" during this period was
Richard Blumenthal–then the
U.S. Attorney for the District of Connecticut—who aggressively pursued Mandanici. Blumenthal later became
Connecticut Attorney General and then
U.S. senator. In the highly contentious 1981 campaign, Mandanici was the target of
death threats and wore a bulletproof vest while campaigning. According to one author, the election of 1981 was "without question" the "wildest election" in city history, a clash "between two bombastic politicians with hard-charging styles"—Mandanici and Paoletta—"who did not much care for each other." In that campaign, a car was firebombed outside the city Republican headquarters and two cars were blown up in Mandanici's driveway. Mandanici lost the election by just 64 votes. His loss was attributed to the federal indictments as well as Mandanici's unpopular demand for a 50% pay raise, which the common council approved. In 1982, the state Elections Commission fined Mandanici $800 for establishing an illegal campaign committee and soliciting funds for it the previous year. Mandanici's son John C. Mandinici Jr., the special committee chairman Mario Testa, and the special committee treasurer George H. Farrell Jr., along with several Bridgeport-area businesses, were also fined. The fines were levied as part of an agreement with the Commission, absolving the parties of any intentional violation of the law. In 1983, Mandanici unsuccessfully attempted to make a comeback as mayor. He failed to win the
Democratic nomination and ran as an
independent candidate instead. In 1985, Mandanici again sought election as mayor but was defeated in the Democratic primary. ==Death==