Nussbaum discusses campus protests. While her examples are drawn from the University of Chicago, they are frequently similar to protests that have happened here.
One point that Nussbaum seeks to make is the free speech and civil disobedience are two separate things. Her argument turns on the premise that civil disobedience involves, well, disobedience: violating the law. Free speech, however, is protected by the First Amendment to the US Constitution. That says that any putative law that violates the freedom of speech is invalid, and so not a genuine law. Here is the text of the First Amendment.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.