New for me but online since 2002: Blood for Oil.
A growing collection of over 300 free anti-war, anti-occupation, anti-empire and peace posters by artists worldwide against war. Stop the insanity. Think of the consequences. Speak your will, because it’s not over.
The site started in the year of the invasion of Iraq. The subject is still a topic today.
As you can imagine many of the artwork at Blood for Oil is about George W and some of them got Adolf H. on it. That’s not original but there is enough other work to enjoy.