Medium Cool (1969) IMDb
A camera man covers racial dissidents and the demonstrations surrounding the Democratic Convention in Chicago, 1968.
A documentary serves to describe broadly interesting non-fiction as the creators see it. There can be no pure documentaries under that definition, and this one is particularly impure, but it has some truth wrapped in a loose fictional frame: There is a staged and fictional plot and a lot of documentary-style footage of historically important unstaged events mixed in at various levels. Made to raise questions about the role of documentaries/news and their makers and viewers.
Unpolished, particularly the silly crash. Frank Zappa’s Mothers of Invention feature somewhat prominently.