Literally. Ironic Sans has a collection of terrorist logos. Of course the "terrorist" tag comes from a Wikipedia list, which means that it'll probably change in the next few days. Quick reaction: the AK-47 in the NPA logo (and the others in the category) really looks odd and wrecks the balance, too. Tupac Amaru looks better.
The most retarded ones come from (not surprisingly) the white supremacists. My personal favorite: Hezbollah.