In its ongoing effort to shut down the free speech of selected groups, Twitter has suspended several accounts associated with the controversial alt-right—a mixed-bag movement that has racist components.
Twitter, of course, is free to limit speech however it wants and according to its own policies. It’s a private company, and like it or not, First Amendment rights don’t apply to privately owned businesses. While your speech is protected in the public sphere—meaning the government can’t punish you for speaking your mind—it’s not protected when you step into the realm of private entities. Twitter is king of its own kingdom, and it can ban anyone it wants.