For a number of years it had been a wish of mine to have an experience as a police officer, to come in contact with tramps and criminals, as a representative of the law. Not that I bore these people any personal grudge, or desired to carry out any pet policy in dealing with them; but I had learned to know them pretty intimately as companions in lodging-houses and at camp-fires, and had observed them rather carefully as prisoners in jails, and I was anxious to supplement this knowledge of them with an inquiry in regard to the impression they make on the man whose business it is to keep an official watch over them while they are in the open. I desired also to learn more concerning the professional offender than it had been possible for me to find about him in tramp life. If one has the courage to go and live with professional criminals as one of them, he can become even more intimate with them than in a police force, but it is very difficult to associate with their class long and not be compelled to take an active part in their criminal enterprises, and my interest in them was not so great that I was prepared to do this. I merely wanted to know how strong they are as a class, in which sections of the country they are the most numerous, whether they have peculiar characteristics differentiating them in public thoroughfares from other types of outlaws, how they live, and what is the general attitude toward them of our police and prison authorities. Partial answers to these questions I had been able to get in Hoboland, but I was anxious to fill them out and get any new facts that would throw light on the general situation.

During the spring and summer of last year (1899) it was possible for me to have a police officer's experience. The chief of a large railroad police force gave me a position as a patrolman, and, in company of two other officers, I was put on a "beat" extending over two thousand miles of railroad property. The work we were given to do was somewhat of an innovation, but it afforded me an excellent opportunity to secure the information I desired. For two months and a half, which was the extent of my connection with the undertaking and with the force, we had to travel over the property, protecting picnic trains, big excursions, passengers travelling to and from towns where circuses were exhibiting, and the ordinary scheduled traffic, whenever there was reason to believe that pickpockets and other thieves were likely to put in an appearance.

Early in the spring wandering bands of thieves start out on tours of the railroads. They follow up circuses and picnics, and make it a point to attend all big gatherings, such as county fairs, races, conclaves, and congresses. Their main "graft," or business, is pocket-picking, but in a well-equipped "mob" there are also burglars, sneak-thieves, and professional gamblers. The pickpockets and gamblers operate, when they can, on passenger trains, and they have become so numerous and troublesome in a number of States that railroad companies are compelled to furnish their own protection for their patrons.

This protection, on the road for which I worked, has generally been provided for by the stationary members of the force, and more or less satisfactorily, but last year the chief wanted to experiment with "a flying squadron" of officers, so to speak, who were to go all over the property and assist the stationary men as emergency required, and we three were chosen for this work. In this way it was possible for me to come in contact with a large variety of offenders, to make comparisons, and to see how extensively criminals travel. It was also easy for me to get an insight into the workings of different police organisations along the line, and to inspect carefully lock-ups, jails, workhouses and penitentiaries.

In the following chapters I have tried to give an account of my finding in the police business, to bring out the facts about the man who makes his living and keeps up a bank account by professional thieving, to tell the truth in regard to "the unknown thief" in official life who makes it possible for the known thief to prey upon the public, and to describe some of the tramps and out-of-works who wander up and down the country on the railroads. There is much more to be said concerning these matters than will be found in this little book, but there are a great many persons who have no means of finding out anything about any one of them, and it is to such that my remarks are addressed. Until the general public takes an interest in making police life cleaner and in eliminating the professional offender and the dishonest public servant from the problems which crime in this country brings up for solution, very little can be accomplished by the police reformer or the penologist.