I found an article originally published on The Conversation by William Kovarik, in the online version of Smithsonian Magazine. It relates the history of how a 1938 Nazi-sympathizer and Catholic priest, Father Charles E Coughlin, found his radio communication channels closed down due to his violent rhetoric. Like Trump after having his online accounts shut down, Coughlin railed against the ban and claimed his rights of free speech were being violated.
By the middle of the 20th century, this would become known as the paradox of tolerance. Philosophers like Karl Popper and John Rawls would insist that, at some point, a society’s tolerance should not be allowed to threaten its own survival.
For Americans who were unsure of how to deal with Coughlin, the paradox was solved by the advent of World War II. In January of 1940, the FBI caught 17 of his followers in a Nazi spy ring, and soon after, calls for more understanding of Nazis were flatly treasonous.
The Smithsonian article is a thorough but short enough read. If you are interested, the original article, it can be found on The Conversation.
Link to Smithsonian article.
Link to article on The Conversation