Two top officials at one of the country’s leading poetry organizations have stepped down amid criticism over its response to the protests against police violence and racism. The Poetry Foundation announced Wednesday that its president, Henry Bienen, and board chairman Willard Bunn III, had resigned, effectively immediately. The foundation did not announce any plans for succession or refer specifically to recent events. More than 1,000 poets and foundation supporters issued an open letter last weekend calling for Bienen and Bunn to leave and be replaced by someone with a greater commitment to diversity and anti-racism.