According to Occupy SF:
Occupy Wall Street West actions will target Wall St. banks and corporations complicit in attacking Bay Area communities, homes, education environment, livelihood, and democracy. The activists demand
that banks stop predatory evictions and foreclosures and an end to corporate personhood; and they aim to continue building and mobilizing a strategic mass movement asserting the people power of the 99% for economic justice and a better world.
The plan is to completely shut down San Francisco's financial district, timed to coincide with the opening of the stock market on Friday. It will end with a march to Justin Herman Plaza, and who knows what else.
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