William Friedkin was able to make the movie because Fox's chairman,
Darryl F. Zanuck, off-handedly said he had $2 million on hand and would OK a production start if Friedkin and his production team could make the movie for that much. Zanuck also warned Friedkin that if done badly, he'd end up with another episode of the TV series
"Naked City" (1958). Friedkin said later that this inspired him to make the Popeye Doyle character a combination of good and evil, because that duality was not something one saw on "Naked City". The director also credited the film
Z (1969) with introducing a near-documentary quality that he applied to own his fictional project.
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