I am researching individuals and families who were held in slavery or indenture to Magruders and related families in the District of Columbia and in Maryland, centered in Prince George's County. What I find, I publish in the "Slavery's Legacy" section of Magruderslanding.com, which is fully searchable for surnames.
Currently, I am particularly interested in Gray, Dodson, Mullen/Mullin, Addison, and Bowie families, as well as African American Magruders (also spelled McGruder), but will be very happy to hear from others. One branch of the Magruder family changed their name to McGregor around 1820, so I am also looking for African Americans with connections to that family. Magruders also moved out into Virginia, the Carolinas, Kentucky, Mississippi, Louisiana, and elsewhere, but so far I have not researched those areas.
My own family employed a black family on a farm in Beltsville up to the 1940s, and I believe that family had a long connection with Magruders, but no one now living knows their name. My great-grandfather was Fielder M. Magruder, and his son Edward Magruder was the last to run the farm. Any information about those who worked for or with him would be warmly welcomed.
If your family has Magruder connections in Maryland, I will do all I can to help with your research.