I want to know the answer to the following question:
What tool did Hoover use to find bootleggers?
All the background I'm provided with is that "In the 1927 case Olmstead v. United States, in which a bootlegger was caught through telephone tapping, the United States Supreme Court ruled that FBI wiretaps did not violate the Fourth Amendment as unlawful search and seizure, as long as the FBI did not break into a person's home to complete the tapping.". Is that enough to answer the question?
Answer: no