Critics in 1970 despised it, but Gimme Shelter has since became one of the most well-regarded concert films of the rock era. Directed by Albert and David Maysles with Charlotte Zwerin, the unusually metatextual film chronicles the Rolling Stones’ chaotic 1969 tour across the United States. At the final stop, the Altamont Speedway outside San Francisco, all hell broke loose and an 18-year old man was murdered, effectively ending the two-and-a-half year stretch that we now tend to think of as “the sixties”. The Maysles Brothers are probably best known at this point for Grey Gardens, which that dives deep into the psyches of two campy but troubled women; here they never get that close to their subjects.
Here’s a very thorough review from 2000.