WASHINGTON — Representative Bill Keating was scribbling furiously in his FSB-branded notebook.
The Bourne Democrat was in a brightly lit conference room in Russian government offices in Moscow in May 2013, sitting at a table across the room from three rows of Russian intelligence officials and officeholders. Alexander Bortnikov, director of the FSB, Russia’s top security service, was reading to Keating and a small congressional delegation a list of dates, times, and communications it had collected about one of the Boston Marathon bombers.