Hi. I have been writing a story (novel) where the MC (an american) gets himself romantically involved with a British woman of Jewish ancestry. The story is set in the 1960s However, I want to make his sidekick/friend have some antisemitic views to increase the tension and conflict between them. I don't want to make him a Nazi/fanatic however. Can anyone help me make him believable? Any tips or material I can read is hugely appreciated.