In July 1956, the Pennsylvania Bar Association Endowment (PBAE) commissioned a comprehensive study of "wiretapping practices, laws, devices, and techniques" in the United States. At the time, Pennsylvania was one of several jurisdictions in the country without a statute regulating eavesdropping. Members of the PBAE's Board believed that a nationwide fact-finding mission had the potential to help state lawmakers establish effective policies for police agencies and private citizens. The man appointed to direct the study was Samuel Dash, a prominent Philadelphia prosecutor whose stint as the city's District Attorney had given him a first-hand look at eavesdropping abuses on both sides of the law. Two decades later, while serving as Chief Counsel of the Senate Watergate Committee, Dash would see many of those abuses come full circle...
The result of Dash's efforts was The Eavesdroppers, a 483-page
report co-authored with Knowlton and Schwartz. Rutgers University Press
published it as a standalone volume in 1959. The book uncovered a
wide range of privacy infringements on the part of state authorities and
private citizens, a much bigger story than the PBAE had anticipated. more (long, in-depth and very interesting)