Salesman is a 1969 direct cinema documentary film directed by brothers Albert and David Maysles, and Charlotte Zwerin.
The documentary follows four salesmen as they travel across New England and southeast Florida trying to sell expensive Bibles door-to-door in low-income neighborhoods, and attend a sales meeting in Chicago. The film focuses in particular on salesman Paul Brennan, a middle-aged Irish-American Catholic from Jamaica Plain, Boston, who struggles to maintain his sales.
Gene Siskel of the Chicago Tribune listed Salesman as one of the ten best films of 1970. In 1992, Salesman was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant."
(Summary from Wikipedia)