Mexico: For noting that biological males were taking advantage of a law meant to help females, Gabriel Quadri’s political career is now in danger.

Talk of Twitter free speech may be all the rage right now in the United States, but a look around the world begs the question: What good is ostensible social-media freedom if governments can silence and sanction you with the harshest of penalties for what you post online?

The international landscape for state censorship of online speech is bleak. There exists a dangerous and mounting global trend to criminalize expression, including online speech, blurring the line between dictatorship and democracy, and wreaking havoc on human rights.

In Mexico, a sitting congressman, Gabriel Quadri, may lose the right to run for office ever again because of what he posted on Twitter...