He is reassigned to the 7th Division, but he immediately discovers corruption. Forced to accompany fellow plainclothes officers as they perpetrate violence, extortion, and collect payoffs, he refuses to accept his share of the money. He informs McLain, who assures him that the police commissioner wants him to continue gathering evidence, and that he will be contacted by the chief's office. Serpico becomes impatient waiting for the promised contact, fearing for his life. Serpico and Blair go to the mayor's assistant, who promises a real investigation and support. Their efforts are stymied by political pressure, and Serpico dismisses Blair's suggestion to go to other officials or the press.
Serpico's colleagues try to convince him to take the payoff money, but he declines. The strain takes a toll on him, and his relationship with Laurie. When Serpico discovers a suspect he arrested receiving special treatment, he brutalizes the man, who he reveals served fifteen years for killing a cop. Frustrated after a year-and-a-half of inaction, Serpico informs McLain that he has gone to outside agencies with his allegations. In front of the squad, Serpico is sent to meet with division inspectors, who explain that his charges never made it up the chain of command. The inspectors inform the commissioner, who orders them to investigate the division themselves, and acknowledges that McLain told him of the allegations.
As the investigation proceeds, Serpico is threatened by the squad, and Laurie leaves him. The district attorney leads Serpico to believe that if he testifies in a grand jury, a major investigation into rampant department corruption will happen. During the grand jury, he is prevented by the DA from answering questions that point up the chain of command. Serpico becomes more frustrated. Knowing his life is in danger, he, Blair, and an honest division commander go to The New York Times. After his allegations are printed, he is reassigned to a dangerous narcotics squad in Brooklyn, where he finds even greater corruption.
During a drug arrest, Serpico is shot in the face when his backup fails to act. He recovers, though with lifelong effects from his wound. Serpico receives a detective's gold shield. He then testifies before the Knapp Commission, a government inquiry into NYPD police corruption. An epilogue reveals that he resigned from the NYPD on June 15, 1972, and that he was later awarded the NYPD Medal of Honor for "conspicuous bravery in action". Its conclusion states that he moved to Switzerland.
After the success of several of his films in the 1960s, and the first years of the 1970s, producer Dino De Laurentiis decided to move from Italy to the United States. The change in financing laws further regulated the Italian film industry, and the producer settled in New York City. Following their collaboration on The Valachi Papers, De Laurentiis purchased the rights to Maas' book. Maas received US$400,000 (equivalent to $2.3 million in 2020) and participation in the film, while the rights for his work were secured before the March 1973 publication of the book. Initially, De Laurentiis' found resistance to the project from Paramount Pictures. The studio considered that "enough cop movies" had been made. In turn, De Laurentiis was supported by Charles Bluhdorn, president of Gulf+Western who wanted the film to be made. De Laurentiis later declared that "no American producer would have had the courage" to depict police corruption in a motion picture.
Salt's work did not satisfy Avildsen, who threatened to leave the project unless he could bring Norman Wexler to write the screenplay. They had previously worked together in Avildsen's Joe. Both then traveled to Switzerland, to visit Serpico at home, and work the details. Time to work on the production was constricted due to Pacino's commitment to The Godfather Part II. Further disagreement arose between Avildsen and Bregman regarding the script, and then the selection of the filming locations. Upon finding resistance to his plans, Avildsen threatened Bregman of quitting multiple times. An aggravated Bregman then called for a meeting with the production team, in order to cause the director to quit in front of witnesses. Avildsen had insisted on a meeting with Bregman and De Laurentiis to shoot a scene in the real home of Serpico's parents for authenticity. The producers felt that the structure could not accommodate the production team and equipment efficiently. The escalating tension on the meeting resulted in De Laurentiis firing Avildsen, and the director quit in return. Avildsen's account for the reason of his dismissal was refusing to cast Cornelia Sharpe as Leslie. Sharpe was at the time dating Bregman. Avildsen would later declare that he should have treated the situation "with more finesse". Sidney Lumet was then hired to complete the job for his reputation as an effective director under a tight schedule.
Lumet organized the 107 speaking parts that took place in 104 different locations. The longest scenes took up two-and-a-half pages of the screenplay, while the average was one page. A budget of $3.3 million (equivalent to $19.2 million in 2020) was assigned. Two weeks of rehearsal were held. Pacino had learned Salt's screenplay, and he agreed with Lumet that Wexler's revised version improved the structure, but that the dialogue was impoverished. Lumet allowed the actors to improvise certain dialogues, and he also allowed their creative input for the scenes. The cast selected dialogues from both scripts as the filming progressed. Though he had already a good knowledge of New York locations, Lumet considered the work "physically brutal, and emotionally tough". The principal photography on Serpico began in early July 1973. The film was planned to be released before Christmas, with four-and-a-half months for the crew to complete the movie. Filming took place in July and August. The story of the film encompassed eleven years, from 1960 through 1971.
To accommodate the scenes around Pacino's facial hair, the film was shot in reverse. Pacino started with long beard and hair. He was shaved to a mustache, and then eventually his hair was cut, and he was clean-shaven for the beginning of the film. Lumet decided each day if Pacino was to be further shaven, and the crew prepared fake beards in case they were required. Winter conditions were simulated, as the team had to defoliate trees and cut shrubs. Special make-up was used to absorb the sweat, and to keep the actors' skin dry. The cast wore winter coats, and their skin was made to look bluish, while their breath had to be visible. The director followed Serpico's desire for the winter to look "cold and heavy", and the summer "idyllic and hazy". The team had difficulty to find locations suitable for the scenes set in the 1960s, since graffiti did not become common until 1970. Lumet shot up to thirty-five different setups daily. The team had to move three times a day on an average. Each location had to be cleared of cars that did not belong to the particular period, and extras could not feature long hair, or non-period wardrobe. Hairdressers were present with the crew. Multiple locations in the city including Harlem, South Bronx, Bedford–Stuyvesant, Brooklyn and Astoria, Queens were used. Lewisohn Stadium was featured shortly before its demolition. The party scene was shot at Sidney Kingsley's fifth avenue loft. The NYPD cooperated with the director, and allowed him to film in four active police stations.
Serpico's apartment had to be built by the crew. It featured a fixed ceiling, and movable walls. As Serpico's original apartment, it was located in Greenwich Village. Through lighting, Lumet and cinematographer Arthur Ornitz chose to maintain a "warm look" on the location. Different techniques were used to reflect moods, and the changes that the character went through the years. Lumet focused on portraying Serpico's struggle to balance his work and personal life, and his increased isolation and alienation, as his efforts produced slow results. The director decided to portray him "darker and darker". As the film progressed, the cast costumes became darker in color, until the courtroom scene, where all the actors wore dark tones. Lumet told Charles Champlin: "I was trying to negate color, to make a picture in color that was not colorful". Meanwhile, he desired Serpico's fellow officers to be "men with charm, who were all the more evil for being human and understandable". Lumet finished shooting the film in fifty-one days, on budget.
The film was released on December 5, 1973 in New York, and on December 18 in Los Angeles. The opening week in New York garnered $123,000. Serpico was released nationwide on February 6, 1974. The film was a critical and commercial success. It grossed between $23.4 million and $29.8 million.
Serpico attended the premiere of the film, but he did not finish watching it. Serpico felt "distant" from the end results. On an interview with Pauline Kael for The New Yorker, he concluded that it "didn't give a sense of frustration you feel when you're not able to do anything". According to Lumet's account, he met Serpico shortly before the production. The director asked him to stay clear of the set, to not make Pacino "self-conscious" regarding his portrayal. Serpico watched the film in its entirety for the first time in 2010. In a later interview, he declared that Lumet barred him from the set after he interrupted the shooting of a scene that "never happened". Serpico also criticized the dismissal of Avildsen by the production team. Serpico and Avildsen remained friends, and shared a property on Long Island for three years in the 1980s. New York City Police Commissioner Michael Codd stated that the film "tends to imply that Serpico was the only honest cop in the whole department". Detective Durk was not pleased with Serpico. Durk, who was depicted in the character of Bob Blair, felt that the movie would deter other policemen to denounce corruption. On an interview with The New York Times, he considered that the movie was unfair to honest police officers. Durk stated that the end of the film conveyed that "the cost of honesty is martyrdom", and Serpico's departure for Switzerland showed him "wounded and frustrated". Meanwhile, Bronx district attorney Burton B. Roberts declared that it "bears absolutely no relationship to the truth". Lumet defended his artistic license on the portrayal of the story, as he felt he desired to make a film that "people believed in". Bregman dismissed the critics, as he felt that the real names were not relevant for viewers in cities outside New York. Maas rebuked Durk's comments regarding honest policemen, and in reference to Serpico being wounded he asked: "where were they?"
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