Cynthia Thomas dreaded being labeled an assassination CT

[Steve M. Galbraith]

https://www.theguardian.com/us-news/2018/apr/22/jfk-documents-could-show-the-truth-about-a-diplomats-death-47-years-ago

His efforts were based on his suspicion that either the Soviets or Cubans were involved in the assassination. Thomas said he believed Oswald shot JFK but that there was evidence, based on Oswald's activities in Mexico City, that he was working with/for either Castro of Moscow.