Below are two letters which I found on westcoastportshutdown.org. They are dated January 19, 2012, and I have not at this time been able to independently verify them.
If they are legitimate, and if the scenario they discuss is real, than this has the potential to be an extremely serious situation, escalating tensions between labor and the federal government to a level not seen in decades.
The letters and links are reproduced below as I found them.
(On Jan. 22, I found confirming articles with some additional information: Obama Deploys Military in Labor Dispute, Statement of S.F. Labor Council dated January 10; Military Resistance 10A12 dated Jan. 13; Military Intervention vs. Maritime Union Power dated Jan. 21.)
UE Local 150 calls on Obama to order military to stand down