Harvard administrators are "slowly trying to dismantle unions," she said.
Geoff P. Carens, also a HUCTW member, said that even $10 is too low compared to Harvard's $14 billion endowment.
A shop steward for the carpenters local 40 said that Cambridge-area unions, including the electricians, plumbers and pipefitters, would support the janitors.
"We've been fighting [Harvard] since 1636 and what a fight it's been," he said.
University spokesperson Merry D. Touborg would not comment, citing ongoing negotiations.