There were four really important gangs in New York at this time. There were other less important institutions besides, but these were little more than mere friendly gatherings of old boyhood chums for purposes of mutual companionship. They might grow into formidable organizations in time, but for the moment the amount of ice which good judges declared them to cut was but small. They would "stick up" an occasional wayfarer for his "cush," and they carried "canisters" and sometimes fired them off, but these things do not signify the cutting of ice. In matters political there were only four gangs which counted, the East Side, the Groome Street, the Three Points and the Table Hill. Greatest of these, by virtue of their numbers, were the East Side and the Groome Street, the latter presided over at the time of this story by Mr. Bat Jarvis. These two were colossal, and, though they might fight each other, were immune from attack at the hands of the rest. But between the other gangs, and especially between the Table Hill and the Three Points, which were much of a size, warfare raged as frequently as among the Republics of South America. There had always been bad blood between the Table Hill and the Three Points. Little events, trifling in themselves, had always occurred to shatter friendly relations just when there seemed a chance of their being formed. Thus, just as the Table Hillites were beginning to forgive the Three Points for shooting the redoubtable Paul Horgan down at Coney Island, a Three Pointer injudiciously wiped out a Table Hillite near Canal Street. He pleaded self-defense, and in any case it was probably mere thoughtlessness, but nevertheless the Table Hillites were ruffled. That had been a month or so back. During that month things had been simmering down, and peace was just preparing to brood when there occurred the incident alluded to by Pugsy, the regrettable falling out between Dude Dawson and Spider Reilly. To be as brief as possible, Dude Dawson had gone to spend a happy evening at a dancing saloon named Shamrock Hall, near Groome Street. Now, Shamrock Hall belonged to a Mr. Maginnis, a friend of Bat Jarvis, and was under the direct protection of that celebrity. It was, therefore, sacred ground, and Mr. Dawson visited it in a purely private and peaceful capacity. The last thing he intended was to spoil the harmony of the evening.