City of Chicago v. O'Brien

The plaintiff in error, William J. O’Brien, was found guilty in the municipal court of Chicago of conducting a private detective agency in the city of Chicago without a license, in violation of an ordinance of the city, and was fined $25 and costs. The validity of said ordinance being involved and the trial judge having certified that in his opinion the public interest required that the cause be taken directly to this court, O’Brien has sued out a writ of error from this court seeking to reverse the judgment of the municipal court.

The ordinance for the violation of which plaintiff in error…