John Wayne and Kirk Douglas never saw eye-to-eye politically, as the latter once confessed in a TV interview.

Duke considered Spartacus to be Marxist propaganda and was infuriated by his liberal co-star when he was once late to set when filming The War Wagon together.

It turned out Douglas had been shooting a commercial to endorse Edmund G Brown, a Democrat, as Governor of California.

This enraged Wayne, a life-long conservative, who was late himself the next day as he’d been filming an…