The regulatory act is 1982 Modified Final Judgement (MFJ)
1982 Modified Final Judgement (MFJ) regulatory act created seven Regional Bell Operating Companies (RBOCs) from 22 former Bell Operating Companies (BOCs).
Regional Bell operating company (RBOC) is the term used to describe one of the U.S. regional telephone companies formed as a result of the December 31, 1983, breakup of American Telephone and Telegraph Company (AT&T, also known as the Bell System or "Ma Bell") by a U.S. Federal Court consent decree. Ameritech, Bell Atlantic, BellSouth, NYNEX, Pacific Bell, Southwestern Bell, and US WEST were the seven original regional Bell operating businesses.
Therefore, the answer is 1982 Modified Final Judgement (MFJ)
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