Apparently most of them come from Eugene, Oregon.
Is this a very leftist city?
From Wikipedia...
Anarchism
During the late 1990s and early 2000s Eugene contained a community of anarchists situated in the Whiteaker neighborhood west of downtown, which gained international notoriety in 1999 due to its perceived role in the battle of Seattle.[29] Following those protests, then-mayor Jim Torrey described the city as "the anarchist capital of the United States."[29] The Eugene anarchist movement grew out of the treesits and forest defense camps of the 1990s and soon began staging demonstrations and riots in Eugene,[citation needed] notably during a Reclaim the Streets event on June 18, 1999, when protesters blocked downtown streets and smashed the windows of three stores, and a few threw stones and bottles at police.[30] The anarcho-primitivist author John Zerzan, known for being a supporter and confidant of the Unabomber, lives in Eugene.
Some of the anarchist activity could be said to have had its start in a "mud people's" protest.[31] On that day, the participants noticed two blocks of trees, in a parking lot near the downtown area, were slated for removal the Sunday following. The ensuing "treesit" protest a week later, on June 1, 1997 was reported widely as it involved a several-hours-long action that was forcibly ended by police using copious amounts of pepper spray. A lawsuit by protesters against police response to that protest was settled five years later.[32]
Anarchist activity in Eugene has declined since September 11, 2001, but the ongoing trials of accused eco-terrorists continue to keep Eugene in the same spotlight.[33]