The attack against the journalists and cartoonists of Charlie Hebdo in Paris is just the latest in the threats faced by cartoonists around the world.
Internationally, cartoons have been a powerful tool in fomenting social movements and challenging power. But that has made cartoonists vulnerable to attack and violence.
Tjeerd Royaards, who edits the website Cartoon Movement, discusses what is done to protect these artists in parts of the world where they are routinely threatened.
Cartoonist contributed to this story.