Civil rights groups were calling for a major leadership change at Facebook one day after a damning report confirmed how the social media giant allowed Russia to use its platform to target African-Americans in the 2016 election. More than two dozen groups sent a joint letter on Tuesday to CEO Mark Zuckerberg urging him and COO Sheryl Sandberg to step down from their roles and asking for a restructuring of the board, pointing to their “profound disappointment regarding Facebook’s role in generating bigotry and hatred towards vulnerable communities and civil rights organizations.”