Heavens! Let's not get started on Chaplin's political affiliations and which Americans were in charge of deciding what they were. Truce! Base! Switzerland! Neutral territory!
Mary Pickford was a staunch Republican, and Kevin Brownlow (on the excellent "Commentary Track" podcast, which everyone should check out) talked about how when he finally got an interview with her, she occasionally went into side rants about communists. Still, she was willing to tour with Chaplin to promote war bonds during WWI, despite many people knowing (much later) that Chaplin had clearly been a communist all along. (Okay! I'll stop! I can't help myself.)
Despite her party affiliation, Mary Pickford did appear with Mrs. Roosevelt at the White House in support of the March of Dimes, as related in this
rather amusing newspaper article.
Of course, Claude Rains appeared, in a chair, at this year's Republican convention.