As a freedom of speech advocate (among many causes), Amnesty International recently released this shockingly bold print ad showing a graveyard full of authors and journalists.
The idea behind this ad is that without the protection of freedom of speech, people who speak their minds are subject to threats from rogue governments and militants who don't agree with their messages or opinions. This graveyard ad paints a very dreary picture of the consequences of not fighting for freedom of speech. In many countries around the world, freedom of speech is not a civil right.
Amnesty International in this case is acting as a freedom of speech advocate, but in general is focused on human rights. It has over 3 million members globally.