Some of the striking phases of this work are the real friendships engendered by our associations with each other. Here the measure of a man is his loyalty and sincerity, his judgment, his grit, and his personal sacrifice. When you can find as many real and true Americans as this organization contains, you need never have worries as to whether this country is going to be safe. Central District of Chicago is that important region covering the great business district, out of which some four hundred men, under four captains, regularly worked all over the city. This is not one of the residence districts, so that the squad of operatives who reported to this branch were far scattered throughout the city for most of the twenty-four hours. The personnel of this district embraced lawyers, doctors, bankers, printers, dry goods merchants, insurance men, mechanics, railway trainmen, traveling salesmen, actors, and all kinds of employed persons. A great many members belonged to the prominent clubs of Chicago. There were interpreters who understood all of the continental languages. There were both rich men and poor men included in this membership. There were boys in the twenties and men of sixty-five. It had come to be the practice of all the interlocking branches of our Governmental defensive organizations to call up Central District for men needed on some particular work. It had been the headquarters squad, and had sent men all over Northern Illinois, and sometimes out of the State. There was a school of instruction for new operatives in this district in which new men are taught the elements of the League work, the elements of espionage laws, and other war measures. They were instructed, also, in the fundamentals of shadow work; the details of the selective service regulations; the principles of law and evidence, and other subjects proper to the activities of the League. There were seven words taught to every operative, applying equally well to complaints and to reports—guide words in investigations. If these seven words were borne in mind at the time of making complaint or investigations, or in writing up the report, an operative would be fairly well assured of embodying the information desired. These words are: “Who,” “Which,” “What,” “Why,” “When,” “How,” and “Witnesses.” Every care was exercised by the operative not to approach the subject himself or to allow him to know he was being investigated. There were countless Chicago Germans and pro-Germans investigated, ticketed, tabulated, and filed away, who to this day do not know that they ever told anybody anything about themselves. Many of these Prussianized Chicagoans to-day wear heavy frowns and look aggrieved.