Cash told the students that he had no obligation to accept the subpoena because he had asked that it be issued to his lawyer.

According to the students, Cash told them, "If you do not leave, the police will be here in less than five minutes and will arrest you all."

At the time of publication Cash could not be reached for comment.

Before Cash's arrival PSLM members tried to distribute leaflets to the HBS students but were greeted with boos and hisses.

"One said, 'Do you know how much I'm paying to be here?'" Morgan said. "Others told us we were wasting our time."

PSLM members say Business School students have generally been unsympathetic to their cause.

"The B-School students were hostile and on his side. He has them in the palm of his hand," Hennefeld said. "From my perspective the B-School is entirely pro-business and does not consider the labor perspective. That's something we are trying to change."

"I was not disappointed that they disagreed with our politics, just that they disapproved of our actions," Morgan said.

According to Hennefeld, the Detroit union has had success with its appeals to other high profile board members. In particular, Rosalynn Carter, wife of former U.S. President Jimmy Carter, resigned from the Knight-Ridder Board because of the labor dispute.

PSLM is unsure of what further action it will take.

"A lot of this depends on the Detroit workers--they gave us their support," Hennefeld said. "A lot of what we do depends on what they decide.