Can someone explain this ad? What was bra burning in the 70s? : r/1970s

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Did “bra burning” ever really happen!?

Patton (1970) - IMDb

100 Women: The truth behind the 'bra-burning' feminists - BBC News

Grace Moore and the truth about 'bra burners' - Wayne State University

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The Bra ad CD-ROM Volume Six: 100 different