About this time a reorganization of the Pinkerton Agency became necessary, through the death of Allan Pinkerton, the founder, and George H. Bangs, the general superintendent; and Robert Pinkerton assumed charge of the investigation at Susquehanna. He undertook the difficult task of picking out one guilty man (or possibly two or three) from a body of fifteen hundred workmen. For, despite lack of evidence either way, there was no doubt in the detective's mind that the money had been taken by some of the employees of either the express or the railroad company. Pinkerton men were taken to Susquehanna and given employment in various positions for the railroad and express companies, their duty being to make friends and hear gossip, and, if possible, in an unguarded moment, at some saloon or boarding-house, or perhaps at the chatty noon hour in the works, secure some important secret. Other detectives came with money in their pockets, and, under the guise of sporting men, made themselves popular at resorts where a poor man come dishonestly and suddenly into money would be apt to spend it. Day after day, month after month, the watch was continued from many points of view, the conversations of hundreds of workmen were carefully noted, the gambling houses and their inmates were kept under constant scrutiny, the lives of this man and that man and scores of men were turned inside out, and all without any one in Susquehanna suspecting it, the general opinion being that the robbery had been put aside along with many other unsolved mysteries. A whole year passed before any promise of success came to cheer the express company and the patient detectives. In the summer of 1884, Robert Pinkerton, having received information that a professional burglar, who had been arrested some weeks previous for a burglary at Milwaukee, had valuable information about an express robbery, immediately journeyed from New York to Milwaukee to interview the man. He learned from the burglar that some years before he had operated with a man named John Donahue; that about the time of the Susquehanna robbery Donahue had been away from home, and that shortly after the robbery he had returned with plenty of money and paid off several old debts. Mr. Pinkerton at once recognized in Donahue a notorious thief who, to escape justice, had taken up his residence at Fort Erie, Canada, where he had opened a hotel. The burglar also gave Mr. Pinkerton a description of a man who had visited Donahue at his hotel on several occasions, and who had the general appearance of a workman. He suspected that this man had been in some way concerned with Donahue in the Susquehanna robbery; he knew that he had resided at one time in Buffalo, New York, and worked in the shops there, and he thought that he might be then living in Susquehanna, Pennsylvania.