United States Attorney John H. Durham has kept such a low profile while handling some of the country's most infamous criminal investigations that he once made New Republic magazine's list of Washington's "most powerful, least famous people." Durham "made his bones," as he would say, prosecuting mobsters, corrupt federal agents and former Connecticut Gov. John G. Rowland. He's been tapped by United States attorneys general to investigate topics as touchy as alleged torture and coverups during CIA investigations. The 67-year-old Groton resident, nominated as Connecticut's top federal prosecutor by President Donald Trump and endorsed by Republicans and Democrats alike, has...