His first guess was that theyâd gotten him mixed up with some other Sergey Aleynikov. The men in black refused to tell him his crime. He resisted none of these actions, but he was genuinely bewildered. Serge was six feet tall but weighed roughly 130 pounds: to hide him you needed only to turn him sideways. They confirmed his identity, explained they were from the F.B.I., handcuffed him, and walled him off from the other passengers. Leaving the plane he had noticed three men in dark suits, waiting in the alcove of the Jetway reserved for baby strollers and wheelchairs.