M. Stanton Evans

Annie Lee Moss was a black woman who worked for the Army as a code clerk in the Pentagon. She was identified by an undercover agent of the FBI as a member of the Communist Party. Moss denied it, the Democrats sprang to her defense, and she has been treated ever since as an innocent victim of McCarthy.

The historical novelist has to consider what has actually happened, while the SF writer is dealing in possibilities, but they are both in the business of imagining a world unlike our own and yet connected to it.