Cara Mund, whose reign as Miss America comes to a close next month, accused the pageant’s parent organization of systematically silencing her in a letter made public Friday. It was the latest setback for the organization, which has struggled to reinvent itself after a string of scandals. In a missive that ran over 3,000 words long, Ms. Mund said that the pageant’s leadership had “reduced me, marginalized me, and essentially erased me in my role as Miss America in subtle and not-so-subtle ways on a daily basis.” She went on to say that members of the organization had prevented her...