Down the rabbit hole(Warning: plot twists discussed in explicit detail)
Alan J. Pakula's The Parallax View, inspired by the assassinations of both John and Robert Kennedy is perhaps not the best film on the subject-- arguably near the top is Fred Zinneman's Day of the Jackal, a lean hide-n-seek thriller about a coldblooded Englishman (but are there any other kind?) plotting to shoot President Charles de Gaulle; on the apex sits John Frankenheimer's The Manchurian Candidate, about an American vice-presidential candidate doubling as Russian agent (Hilarious idea! Now where have we seen that before?) plotting to assume top spot by having his running mate killed (?!).
Arguably this film isn't even Pakula's best-- I'd nominate All the President's Men for the honor, the director's crackerjack smart adaptation of Woodward and Bernstein's bestselling account of the Watergate Hotel burglary, and the consequent investigation that helped pull down the Nixon Administration.
That said, and despite the inherently silly premise (all-powerful secret organization grooming political assassins), the bizarre bits peppering the narrative, I call this Pakula's most emblematic film, and lemme explain why--