Hoff was called to the stand eight times during a grand jury investigation along with 748 other witnesses who testified. Even though he denied to being a part of the bootlegging empires in Philadelphia, Philadelphia District Attorney John Monaghan nicknamed him the "King of Philadelphia's Bootleggers". Despite the great amount of evidence stacked against him, Hoff was never indicted during the trials, because (according to a New York Times reporter) Hoff "had scrupulously avoided signing any documents connected to the undercover operations".
