The Saint Patrick's Day Four
The Saint Patrick's Day Four (also, The Saint Patrick's Four, or SP4) are four American peace activists of Irish Catholic heritage who poured their own blood on the walls, posters, windows, and a US flag at a military recruiting center to protest the United States' impending 2003 invasion of Iraq. Peter De Mott, Daniel Burns, Teresa Grady, and Clare Grady each were members of the Ithaca Catholic Worker community, which teaches that Christians should practice non-violence and devote their lives to service of others.
Source: Wikipedia — The Saint Patrick's Day Four (CC BY-SA 4.0)