Three of the four acts expired shortly after they were signed into law in the late 1700s. One remains active-and it's been at the center of constitutional debates ever since.

It’s an alarming accusation, and when it is made, it is often a serious danger to free expression. In many nations, including the U.S., the threat of sedition prosecutions has been used to criminalize ...

Donald Trump is expected to invoke a rarely-used Alien Enemies Act of 1798 in an effort to ramp up deportations.