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In flowing text, I can't find out what is the meaning of "by"; Dos it mean that the American Medical Association helped her in reversing such policy or that she reversed a policy that was written by the Association?

In 1964, she succeeded in reversing a policy by the American Medical Association that prohibited doctors from discussing birth control with their patients.

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Ali2022Does it mean that the American Medical Association helped her in reversing such the policy Emotion: no or that she reversed a policy that was written by the Association Emotion: yes?

CJ

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Ali2022In flowing text, I can't find out what is the meaning of "by"

That "by" is a mistake by the writer. It should be "of".

 CalifJim's reply was promoted to an answer.