You can literally feel the soot and creosote emanating from the screen here. So grubby, dirty, gritty. Cinema verite comes to Beantown. Robert Mitchum was a force of nature.
The combination of Nixon, Kent State, the debt crisis, and Vietnam produced a sort of deep cynicism of the 70s that made the neo-noir a staple of New Hollywood filmmaking. The 1970s is peak American cinema.