Records related to MCI's filings with the FCC can be also found in other series of the MCI Records: Series V. Regulation and Public Policy (Records of Robert D. Swezey, Jr.), Series VI. Regulatory Affairs (Records of Kenneth A. Cox), and the sub-series B. Haley, Bader and Potts MCI Client Files of the present series. Being a part of a regulated industry, MCI devoted extensive resources to regulatory activities. These activities are presented here in convenient chronological order, by the FCC docket numbers, and together with material in the mentioned above series, especially Series VI, focus attention on the role of MCI in the development of a competitive telecommunication industry in 1970's and first half of 1980's. Material of the subseries is divided in 4 groups: 1. Applications with the FCC; 2. FCC Dockets (by numbers); 3. Miscellaneous; 4. Additional Docket Material presenting dockets which chronologically preceded the dockets in group 2.