sentences:  Organized by the DES (Department of Environmental Services), it was approximated that at least 95% of "leaflets, posters, streamers and billboards" were cleared, in according with an ordinance "prohibiting the defacement of walls and public spaces".In Taipei, Taiwan, the removal of election litter was ordered to give residents "a clean city".In 1984, the United States Supreme Court held that although political signs are protected under the First Amendment the state may enact and enforce content-neutral laws to limit their "visual assault on the citizens".