From www.screenrant.com:
"In the 1970s, a new generation of filmmakers created grungy, gutsy cinematic tales and characters that changed the face of Hollywood. As these directors, who were all white men, broke into the mainstream, legions of independent and international directors were also pushing envelopes and breaking boundaries for different audiences.
Nothing testifies to this like the plethora of dark comedies released during the 1970s. Full of gallows humor, morally unsound characters, and endless social commentary, these films remain among the best of their decade. In fact, every year in the 1970s saw the release of at least one fantastic, influential dark comedy."