The controversial columnist, Katie Hopkins, recently came under fire for a column in which she compared migrants to cockroaches. With somewhat unfortunate timing "The Sun" took an editorial decision to publish the article just hours before a fishing vessel packed with migrants capsized off the coast of Libya.
Star Wars creator George Lucas is famous for taking companies to court. He once sued an artist who made Stormtrooper outfits, and even threatened a company which developed headsets that you control video game characters with your mind.
Although no employer can truly be safe from being sued by an employee, there are certainly ways to reduce the risk of it happening in the first place and, if one does arise, to prevent it from being successful.