I never knew just when I passed the border into Germany because no frontier official stopped me. I thought it odd that there should be a border warfare so recently and all sorts of secret police, and yet no customs official in sight, but it was so. But I knew when I was in Germany by the flags. They hung from all the houses. They were bright red with a black swastika in a white circle in the middle, and sometimes they hung from the second storey to the ground. There were often several on one house — one for…