One of them was John Wayne, who was a conservative. He was behind the deal 100%.
Here is some info...
More recently, he found himself the target of much hate mail from the right wing, whose political idol he had been, after he supported President Carter's espousal of the Panama Canal treaties. He did not mind. Although his basic views had not moderated, his tolerance, it seemed, had.
He had even shown up at a function to congratulate Jane Fonda, who was to the left what he was to the right, on winning a screen award.
Here is the link to the source.
http://www.jwayne.com/biography.shtml
I saw a rerun a few years back of a debate with William F. Buckley supporting it with Governor Reagan against it. It was amazing that the dumb actor had a much better grasps of the facts than the intellectual Buckley.