It was Lucile Ball's grandfather, Fred Hunt, that got Lucille involved with the communist party. Desi's book covers that period about his ex-wife. I thought it was a good example of the era and what those close to the action went through. Of course, the only thing Red about Lucy was her hair. Even that wasn't real! (I borrowed that from Desi)
Her grandfather ? Oh, sorry ... I recalled incorrectly.
OTOH, the movie starts and writers, called before HUAC, were mostly guilty of far more than a youthful fling with Communism.
Lucille Ball was a natural blonde ...I thought everyone knew that. LOL