But the power of the pull was to make itself felt in a still more painful fashion. Mr. Costello had several agents canvassing for orders for the book, and for advertisements. He did his best to obtain from those agents the Croker letter, and succeeded in doing so in all but two or three cases. As he had already spent his money, the only thing he could do was to continue to push his book. His agents, no doubt, when canvassing made as much capital as they could out of the credentials which Mr. Costello had originally received from the Fire Department. This was resented, and it seems to have been decided to “down” Costello. The method adopted was characteristic. The Fire Commissioners and the Police were two branches of Tammany administration. When Mr. Costello’s canvassers were going about their business, they were subjected to arrest. He had as many as half-a-dozen of his canvassers arrested at various times. They were seized by the police on one pretext and another, locked up all night in the police cell, and then liberated the next morning, without any charge being made against them. The application of this system of arbitrary arrest effected its purpose. The terrorised canvassers refused to seek orders any longer for Mr. Costello’s book. One or two, however, still persevered. In November, 1888, two of them, who had retained the original certificate, were arrested in the First Precinct at the instance of Captain Murray of the Fire Department, who said that they were professing to be connected with the Fire Department, with which they had nothing to do. Mr. Costello, accompanied by his book-keeper, Mr. Stanley, went down to the police-station to endeavour to bail his canvassers out. Mr. Costello had no fear for himself, as he believed Captain McLaughlin was his friend--a friendship based upon the Captain’s belief that Mr. Costello’s influence had counted for something in securing his captaincy. Mr. Costello complained of the repeated arrests, and declared that he would not let it occur again if he could help it. Captain McLaughlin showed him the books that had been taken from the imprisoned canvassers, in one of which there was a loose paper containing the memorandum of sales made on that day, and a copy of the Croker letter. Mr. Costello at once took possession of the letter, which he had been trying to call in for some time. He showed it to the Captain, and then put it in his pocket, telling the Captain that if it was wanted, he would produce it in court the next day. The Captain made no objection, and they parted, apparently on friendly terms.