According to Daily Kos, The New York Transit Workers Union (TWU) voted to support the Wall Street Protestors at their meeting last night.
A member of TWU Local 100 told a reporter that they would join the protest Friday at 4PM.
Here's more about them from their website:
The TWU has four main divisions: Railroad; Gaming; Airline; Transit; and Utility, University and Service. The Union has 114 autonomous locals representing over 200,000 members and retirees in 22 states around the country.
Occupy Wall Street has been picking up some decent support from unions in the past few days. Yesterday we reported that the Teamsters Union declared their support for protestors, and we also found out that the United Pilots Union had members at the protest demonstrating in uniform.
Today we learned the Industrial Workers of the World put a message of support on their website as well