Narrated by E. G. Marshall, this film produced and directed by Charles Guggenheim documents how a law is enacted by the United States Congress—in this instance, H.R. 6161, a bill to amend the Clean Air Act. The film follows the journey of one piece of legislation from conception through committee amendment and final passage. (1979; 58 minutes.) Scheduled to introduce the film will be Senator Ed Markey, who was one of the co-sponsors of HR 6161. Following the screening, Sen. Markey and Bob Kaiser, senior correspondent of The Washington Post and author of the recent book, Act of Congress: How America's Essential Institution Works, and How It Doesn't, will discuss the film and answer audience questions. This screening is presented in partnership with the 2014 Environmental Film Festival in the Nation’s Capital.