On Saturday, April 17, guards worked 62 hours of overtime, the document shows. The next day, guards worked more than 71 hours of overtime.

"I've got guys working 40 hours straight," McCombe says.

Reid says that he has worked for more than 30 hours at a time before.

"If Harvard seems so concerned with dollars and cents, then why don't they hire new guards?" McCombe said.

Contract talks between the union, which also represents the University's parking guards and Fogg museum guards, stalled last month.

Union negotiators accuse the University of not offering any valid counter-proposals, and the University has accused the guard union of waging their campaign in the press.

Other University officials say that the option of hiring a less expensive security agency is hampering the guard's efforts at securing a new contract.

Nash says another meeting has been scheduled, but he declined to say when.

"I'm hopeful that an agreement with them can be reached," he says. "I don't know if I can go so far as to say that I'm confident."