The Critic finds a great historical parallel between the NSA and phone records and the precursor to the NSA called The Black Chamber:
“With the end of the war [WWI] came another problem: the Radio Communication Act of 1912 was again in effect. This act provided that the government would guarantee the secrecy of communications:
No person or persons engaged in or having knowledge of the operation of any station or stations shall divulge or publish the contents of any messages transmitted or received by such station, except to the person or persons to whom the same may be directed, or their authorized agent, or to another station employed to forward such message to its destination, unless legally required to do so by the court of competent jurisdiction or other competent authority.