YIPL (Youth International Party Line), n.: The first phone phreak newsletter, published in New York from 1971 through 1984 or so. Changed its name to TAP, standing first for Technological American Party and then later for Technical Assistance Program. Direct predecessor to 2600: The Hacker Quarterly.
Toll fraud, n.: Unsurprisingly, what YIPL was investigated for in 1974 by the FBI.
Atomic Energy Act, violation of, n.: Surprisingly, what TAP was investigated for by the FBI in 1979 ... because they had atomic bomb plans!
Read all about it in FBI files 100-NY-179649 and 117-NY-2905, posted at historyofphonephreaking.org.