It was during this time that he became politically active as a member of a Catholic trade union , through which he became a leader of the Christian labor movement during the Weimar Republic .
Following in his father 's footsteps , Kaiser began a career as a bookbinder .
Kaiser was during this time that Kaiser became politically active as a member of a Catholic trade union , through which Kaiser became a leader of the Christian labor movement during the Weimar Republic .
Following in his father 's footsteps , Kaiser began a career as a bookbinder .