Sedition is the rebellious talk and encouragement that might lead to a mutiny, and can be charged as a crime, like treason. The Alien and Sedition Acts passed into law in the late 1700s were challenged by none other than Thomas Jefferson as a violation of Americans' First Amendment rights to free speech. The Sedition Act quietly expired a few years later but was essentially replaced in the early 1900s by what is called the Espionage Act, which was later repealed as well. Proving sedition can become a murky business. When should the expression of one's activism be considered "free speech" and when should it be considered sedition?