Dear Mr. Thomas,
Thank you for posting your request on History Hub!
Since the Mashantucket Pequot Tribe was not recognized by the federal government until 1983, the National Archives would have very few records of those who remained in Connecticut. We suggest contacting the Bureau of Indian Affairs for any records they may have. We also suggest contacting the Mashantucket Pequot Tribe as well for rolls that they may have kept over the years.
We hope this is helpful. Best of luck with your research!
[Information provided by Cody White, Subject Matter Expert]