Do you happen to know which federal agency or department did the investigation?
Merceria Ludgood is a Mobile Alabama county commissioner and her contact information is available at https://www.mobilecountyal.gov/district-1/
I would suggest that you contact her to get the name federal agency that did the investigation and the name of the report. Federal records are stored by the agency or agencies that created the records.
Dear Ms. Nodar,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Closed Investigations Case Files , 1974 - 1980; Official Program Subject Files, 1978 - 1979; General Records, 1974 - 1984 and Program Correspondence Files, 1975 - 1978 in the General Records of the Department of Housing and Urban Development (Record Group 207) that may have records related to this matter if the investigation was conducted by HUD or involved HUD funds. We also located Class 144 (Civil Rights) Litigation Case Files and Enclosures, 1936 - 1997 in the General Records of the Department of Justice (Record Group 60) that may include a file if the investigation was conducted by the Civil Rights Division of the Department of Justice. For more information about these records, please email the National Archives at College Park - Textual Reference (RDT2) at Archives2reference@nara.gov.
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If the investigation was performed by the Federal Bureau of Investigation, you would need to file a FOIA request with the FBI in order to get the case number. Some of their material is available on the FBI Vault.
You may wish to search 1977 local and state newspapers for articles on the investigation and the report that can provide more details about which agency created it.
We hope this is helpful. Best of luck with your research!