"The captains, sergeants and officers so detailed are instructed that they are sent to the place designated for the purpose of doing strict police duty. They will see that the streets and sidewalks are not obstructed, and that no violations of the law are permitted." [110] Under the San Francisco municipal charter, the District Attorney has charge of criminal cases, and the City Attorney of civil cases in which the city is concerned. The City Attorney also acts as adviser to the Mayor and Board of Supervisors. The two are independent offices. [111] Shortridge stated that as amicus curiae, it was his duty to see that the proceedings were without flaw. Heney refused to take him seriously, however, referred to him facetiously as the "curious friend of the Court." and suggested that the Court unassisted might be able to determine what was competent evidence. [112] The following nineteen citizens composed the Grand Jury that conducted the investigation of San Francisco "graft" charges: E. J. Gallagher, photographic supply dealer; Frank A. Dwyer, real estate; Herman H. Young, baker and restaurant proprietor; Mendle Rothenburg, liquor dealer; James E. Gordon, merchant; Alfred Greenebaum, merchant; Wallace Wise, haberdasher; Jeremiah Deasy, insurance agent; Rudolph Mohr, brewer; C. G. Burnett, capitalist; Charles Sonntag, merchant; Morris A. Levingston, liquor dealer; B. P. Oliver, real estate; W. P. Redington, druggist; Christian P. Rode, drayman; Ansel C. Robinson, merchant; Dewey Coffin, real estate; F. G. Sanborn, law book publisher; Maurice Block, merchant. CHAPTER VIII. RUEF LOSES THE DISTRICT ATTORNEY'S OFFICE. While the impaneling of the Grand Jury was going on before Judge Graham, Ruef was disputing Langdon's title to the office of District Attorney before Judge Seawell. In these proceedings Samuel M. Shortridge appeared with Ruef's attorney, Ach, and Deputy City Attorney Baggett, not as amicus curiæ, but as Ach's associate in the legal contest to force Langdon out of office. The principal feature of Ruef's case was the introduction of affidavits, signed by sixteen members[113] of the Board of Supervisors, in which the Supervisors denied committing felony of any character. Later, after the Supervisors had confessed, these affidavits were to be used by the defense at practically all the graft trials in efforts to break down their testimony against the bribe-givers.