Serpico (1973) on Netflix

Biopic of the New York City detective whose anti-corruption efforts in the 1960s and early 1970s led to the creation of the Knapp Commission and the uncovering of widespread corruption of police officials at all levels. All of his life, Frank Serpico had wanted to be a policeman. He learns at an early stage in his career however that even the cop on the beat is somewhat corrupt accepting free meals and the like. As he advances in his career he finds that corruption is rampant, particularly in the Plainclothes Division, where they collect more in graft that they do in salary. His refusal to take any money puts him in bad stead with his colleagues to the point that his life may be in danger. Transferred to the Narcotics Squad, he is shot by a drug dealer when his partners fail to support him. Serpico resigned from the NYPD in 1972.