Its 70s throwback week as we add three classics from that decade to our collection. In “The French Connection”, street cop Popeye Doyle (Gene Hackman) tries to bring down a heroin ring. This realistic cop drama won five academy awards in 1971, including best picture. “Saturday Night Fever” (1977) pits the disco nights of Brooklynite Tony Manero (John Travolta) against the dreary reality of his life: a dead-end job, squabbling parents, racial tensions, and gang connections. The film was based on a story that took the Brit clash of Mods and Rockers and set it in the US. The pumping Bee Gees score and Travolta’s steamy presence made it a hit. Finally, “North Dallas Forty” offers an unromantic look at the world of pro football. There is violence—on and off the field-, rampant use of painkillers, drugs and alcohol, and a coaching staff that is at once impersonal and cruelly manipulative. Screenwriter Peter Gent drew on his experiences with the Dallas Cowboys in crafting his tale. Nick Nolte, who plays an aging receiver struggling to stay competitive, nails the right mix of jock swagger and veteran insouciance.