The hatch to the front compartment swung open for the first time. One man came out. He turned at once to make sure that the air-tight door behind him had locked. Satisfied that it had, he turned again to look down the cabin at us. His face showed that insolence we'd learned to know as the uniform of the "Bupo", the State Secret Police. The man from Bupo walked down the aisle between the passengers toward the rear of the car. He swept his eyes right and left like a suspecting-machine, catching ev