american society. they had watched them for months recording dropoffs of packages and meetings on staircases. even one meeting just yards from cnn s offices in new york. the u.s. believes the group never got its hands on classified information but the russian infiltration into the u.s., a classic moscow move. what they do is more than just collect. they actually try fluns events to the benefit of russia all over the world. this is something they have done for decades. reporter: within days at the airport in vienna, an elaborately core rio graphed transfer. the ten russians traded back for four other russians charged with being in touch with western intelligence services. now, the state department is expelling 35 russian officials it says violated their