Roy Olmstead was a suspected bootlegger. Without judicial approval, federal agents installed wiretaps in the basement of Olmstead's building (where he maintained an office) and in the streets near his home. Olmstead was convicted with evidence obtained from the wiretaps. This case was decided along with Green v. United States, in which Green and several other defendants were similarly convicted, based on illegally obtained wire-tapped conversations, for conspiracy to violate the National Prohibition Act by importing, possessing, and selling illegal liquors. This case was also decided with McInnis v. United States.
