Occupy's anarchists seen as both divisive, crucial

[ellisonz]

1. A black bloc is not an organized group...

...it is a tactic adopted by anarchist organizations.

A black bloc is a tactic for protests and marches whereby individuals wear black clothing, scarves, ski masks, motorcycle helmets with padding, or other face-concealing items.[1][2] The clothing is used to conceal marchers' identities, appear theoretically as one large unified mass, and promote solidarity.

The tactic was developed in the 1980s by autonomists protesting squatter evictions, nuclear power and restrictions on abortion among other things.[1] Black blocs gained broader media attention outside Europe during the 1999 anti-WTO demonstrations, when a black bloc damaged property of GAP, Starbucks, Old Navy, and other multinational retail locations in downtown Seattle.[1]

When used in the plural, black blocs refers to groups who have adopted the tactic.[3]

http://en.wikipedia.org/wiki/Black_bloc