Kho'WLTON, C. J.
This is a petition for a writ of prohibition to restrain the defendants, members of the board of aldermen of Chicopee, from proceeding with a hearing or investigation of conduct of the petitioners as members of the licensing board of said city, appointed under the provisions of the R. L. c. 100, § 3. The case was heard before a single justice upon the petition, answer, and an agreed statement of facts, and, after ruling that a writ of prohibition should not issue, he reserved the case for the full court. All the averments of matters of fact contained in the pleadings are agreed to be true.
It appears that the board of aldermen passed an order that *239they “ enter upon an investigation in reference to the granting of junk dealers’ licenses and other matters during this and preceding years,” and provided for the summoning of witnesses and the attendance of the city solicitor, and, in the order, gave authority to persons summoned as witnesses to be represented by counsel. The petitioners and many other persons were summoned as witnesses, and the hearing was begun. Numerous affidavits had previously been filed with the board of aldermen, in relation to the granting of licenses to junk dealers, some of them setting forth the payment of money to secure such licenses. Three other affidavits have been filed, referring to conduct of one, at least, of the petitioners, in reference to the granting of liquor licenses. In regard to the investigation as to the granting of junk dealers’ licenses no question is made. After testimony had been received in regard to that subject, a witness was asked a question as to liquor licenses, and he refused to answer. Without further action or apparent attempt at action the aldermen adjourned the investigation, and this petition was brought. It appears by the averments of the answer that the respondents never assumed jurisdiction over the petitioners, nor intended to assume such jurisdiction,- that no charges were formally preferred against the petitioners or against any officers of the city, although some of the affidavits already referred to implied improper conduct on the part of one or more of them, and no persons were summoned before the aldermen except as witnesses. The respondents “admit that they have no authority to deal directly with, or to take action directly against, or exercise any authority over said petitioners as members of the board of license commissioners, and that they have no authority to compel witnesses to attend and testify before said board relative to any action of said petitioners as members of said board of license commissioners.” They aver that it was their privilege and duty, as the only representative legislative body in the city, to receive any evidence which might be voluntarily laid before them that may tend to show misconduct on the part of any officer of the city, to the end that they may take proper action to prevent the continuance of such misconduct, if any is found to exist.
Upon these facts it is plain that the court ought not to issue *240a writ of prohibition. Such a writ can only issue to prevent improper judicial action. It appears that the respondents are not acting judicially, or assuming authority to pronounce any judgment which will affect the rights of anybody. The aider-men of Chicopee, under the charter of the city, are a legislative body constituting the entire legislative department of the city. St. 1897, c. 239, § 2. It can act judicially only for certain specified purposes under the laws. It cannot act judicially in such an investigation as was proposed. There is, therefore, no ground on which the writ can be issued. Washburn v. Phillips, 2 Met. 296. Connecticut River Railroad v. County Commissioners, 127 Mass. 50, 58. Hyde Park v. Wiggin, 157 Mass. 94, 99. Smith v. Whitney, 116 U. S. 167. In re Radl, 86 Wis. 645. Ex parte Death, 18 Q. B. 647. In re Local Government Board, 16 L. R. (Ir.) 150. How far and with what effect the investigation can proceed upon testimony voluntarily offered, it is not necessary in this case to consider.
G. T. Callahan, for the petitioners.
L. H. Hitchcock, for the respondents.
Petition dismissed.