Facebook CEO Mark Zuckerberg’s personal security chief faces accusations of sexual misconduct and making racist and homophobic comments, according to a report Thursday by a business news site. In a detailed article, Business Insider cited legal letters reportedly written by former employees of Zuckerberg’s household staff. The letters reportedly described pervasive discriminatory conduct and severe levels of sexual harassment and battery, including racist and homophobic comments about members of Zuckerberg’s staff and his wife, Priscilla Chan. The security chief, Liam Booth, is a former Secret Service officer, according to his LinkedIn profile, and has been with the family’s charitable organization,...