Altogether, there are about three thousand thieves of various kinds, known to the officers of justice in New York, who live by the practice of their trade. They are divided into various classes, each known by a distinctive title, and to each of which its respective members cling tenaciously. These are known as Burglars, Bank Sneaks, Damper Sneaks, Safe-blowers, Safe-bursters, Safe-breakers, and Sneak Thieves. The last constitute the most numerous class.

The Burglar is the aristocrat of crime, and you cannot offend

him more than by calling him a thief. He scorns the small game of the sneak thief, and conducts his operations on a large scale, in which the risk is very great, and the plunder in proportion. His peculiar “racket” is to break open some first-class business house, a bonded warehouse, or the vaults of a bank. The burglar class has three divisions, known to the police as Safe-blowers, Safe-bursters, and Safe-breakers. They are said to be less than 250 in number, those of the first and second class comprising about seventy-five members each. The safe-blowers are accounted the most skilful. They rarely force an entrance into a building, but admit themselves by means of false keys made from wax impressions of the genuine keys. Once inside, their mode of operation is rapid and systematic. They lower the windows from the top about an inch. This is usually sufficient to prevent the breaking of the glass by the concussion of the air in the room, and not enough to attract attention from without. The safe is then wrapped in wet blankets, to smother the noise of the explosion. Holes are then drilled in the door of the safe near the lock, these are filled with powder, which is fired by a fuse, and the safe is blown open. The securing of the contents requires but a few minutes, and the false keys enable the thieves to escape with ease. This method of robbery is very dangerous, as, in spite of the precautions taken, the explosion may produce sufficient noise to bring the watchman or the police to the spot. Experienced burglars only engage in it, and these never undertake it without being sure that the plunder to be secured will fully repay them for the danger to be encountered. This knowledge they acquire in various ways.

The Safe-bursters are the silent workers of the “profession.” Like the class just mentioned, they enter buildings by means of false keys. They adopt a thoroughly systematic course, which requires the combined efforts of several persons, and consequently they operate in parties of three and four. They first make the safe so fast to the floor, by means of clamps, that it will resist any degree of pressure. Then they drill holes in the door, and into these fit jack-screws worked by means of levers.

The tremendous force thus exerted soon cuts the safe literally to pieces, and its contents are at the mercy of the thieves. The whole process is noiseless and rapid, and so complete has been the destruction of some safes that even the most experienced detectives have been astounded at the sight of the wreck. Such an operation is never undertaken without a knowledge on the part of the thieves of the contents of the safe, and the chances of conducting the enterprise in safety. The Safe-blowers and bursters do nothing by chance, and their plans are so well arranged beforehand that they rarely fail.

The Safe-breakers, though really a part of the burglar class, are looked upon with contempt and disowned by their more scientific associates in crime. They do nothing by calculation, and trust everything to chance. They enter buildings by force, and trust to the same method to get into the safes. Their favorite instrument is a “jimmy,” or short iron bar with a sharp end. With this they pry open the safe, and then knock it to pieces with a hammer. In order to deaden the sound of the blows, the hammer is wrapped with cloth. They are not as successful as the others in their operations, and are most frequently arrested. Indeed the arrests for burglary reported by the Police Commissioners occur almost exclusively in this class. A really first-class burglar in a prison cell would be a curiosity in New York.

Closely allied with the Safe-blowers and bursters is a class known as Bed-chamber Sneaks. These men are employed by the burglars to enter dwellings and obtain impressions in wax of keys of the places to be robbed. They adopt an infinite number of ways of effecting such an entrance, often operating through the servant girls. They never disturb or carry off anything, but confine their efforts to obtaining impressions in wax of the keys of the store or office to be robbed. The keys of business houses are mainly kept by the porters, into whose humble dwellings it is easy to enter. When they wish to obtain the keys of a dwelling, they come as visitors to the servant girls, and while they stand chatting with them manage to slip the key from the lock, take its impression in wax, and return it

to the lock, unobserved by the girl. They are generally on the watch for chances for robberies, and report them promptly to their burglar confederates.

The Bank Sneak is better known as the Bond Robber. He is of necessity a man of intelligence and of great fertility of resource. He steals United States Bonds almost entirely, and prefers coupons to registered, as the former can always be disposed of without detection. He manages, by means best known to himself, to gain information of the places in which these bonds are kept by the banks, of the times at which it is easiest to gain access to them, and the hours at which the theft is most likely to be successful. All this requires an immense amount of patient study and of personal observation of the premises, which must be conducted in such a way as not to attract attention or excite suspicion. When everything is ready for the commission of the deed, the thief proceeds to the place where the bonds are kept, seizes them and makes off. If a package of bank notes is at hand, he adds that to his other plunder. Usually his operations are so well planned and conducted that he is not observed by the bank officers, and he escapes with his plunder. Once at large, he proceeds to sell the bonds, if they are coupons, or to use the bank notes, if he has secured any. Registered bonds require more care in their disposition. Generally the bank offers a reward for the arrest of the robber and the recovery of the goods, and calls in a detective to work up the case. The thief at once manages to communicate with the detective, and offers to compromise with the bank, that is, to restore a part of the plunder upon condition that he is allowed the rest and escape punishment. Ninety-nine times out of a hundred his offer is accepted, the bank preferring the recovery of a part of its loss to the punishment of the thief. In this way the thief secures a large part of the amount stolen, sometimes one-half. Should the thief be caught with his plunder upon him, and the bank be thus saved from loss, which is rare, the offender is turned over to the police, and the bank joins heartily in the effort to send him to the penitentiary.