The organization that used to be known as ACORN no longer formally exists, but its staffers have formed the nucleus of new groups such as New York Communities for Change. The NYCC now supports the Occupy Wall Street movement with fundraising and staffing.
The Left's own Mother Jones describes how labor unions provided early support for the Occupy movement. Other blogs have reported on how labor union activists were apparently brought in by bus and paid to appear in Occupy events.
A story this big deserves an ironic cant. Goldman Sachs pulled out of a fundraiser for a credit union when it discovered Occupy Wall Street would be an honoree. GS does not share any target markets with that credit union so concern over anti-trust collusion should not have been a deal-breaker. It is safe to say that GS is not part of the living systems support structure.