Anarchists have been part of the U.S. political landscape in various forms since the late 1800s. They normally maintain a fairly low profile. Occasionally, their acts garner public attention, as with the assassination of President William McKinley in 1901 or the Sacco and Vanzetti case in the 1920s. More recently, they were active in the late 1990s. Anarchist protesters found the media spotlight when they formed a black bloc that caused considerable damage during the Nov. 30, 1999, World Trade Organization meeting in Seattle, which became known as "the battle of Seattle" or just N-30 (for Nov. 30) in the protest community. Anarchists in Europe were also active during this time, frequently conducting violent actions during events such as World Trade Organization meetings, G-8 summits and the annual World Economic Forum. They also held large, violent demonstrations on May Day.