“One study of Nazi records found that of a sample of 213 denunciations, 37 percent arose not from heartfelt political belief but from private conflicts, with the trigger often breathtakingly trivial. In October 1933, for example, the clerk at a grocery store turned in a cranky customer who had stubbornly insisted on receiving three pfennigs in change. The clerk accused her of failure to pay taxes. Germans.”

“One study of Nazi records found that of a sample of 213 denunciations, 37 percent arose not from heartfelt political belief but from private conflicts, with the trigger often breathtakingly trivial. In October 1933, for example, the clerk at a grocery store turned in a cranky customer who had stubbornly insisted on receiving three pfennigs in change. The clerk accused her of failure to pay taxes. Germans.”

— Erik Larson