Meanwhile, Twitter has suspended several accounts of prominent members of the “alt-right” movement, criticized for being a haven for white nationalists. But Twitter has not suspended the account of Stephen Bannon, Donald Trump’s chief strategist and a leader of the alt-right movement. Feminists and people of color have for years called on Twitter to crack down on online harassment and abuse. This year, best-selling author and feminist writer Jessica Valenti quit using social media after she received a rape threat aimed at her child.