How did the National Rifle Association, America’s most influential gun-rights group, amass its power? A New York Times investigation has revealed the secret history of how a fusty club of sportsmen became a lobbying juggernaut that would compel elected officials’ allegiance, derail legislation behind the scenes, and redefine the legal landscape. Mike McIntire, an investigative reporter for The Times, sets out the story of the N.R.A.’s transformation — and the unseen role that members of Congress played in designing the group’s strategies. Guest: Mike McIntire, an investigative reporter for The New York Times.