I am old enough to remember the Oscar award to Marlon Brando for "Last Tango in Paris." He didn't attend the ceremony, but had a native
American woman accept the award on his behalf. So the woman started in and spoke about the mistreatment of Native Americans. There was a lot of booing and hissing from the audience as she spoke. I guess actors have always used their acceptance speeches to inject their political views.
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Opening Wide for My Goddess