Three Dorchester-based demonstrators arrested early Tuesday morning at the ongoing Occupy Boston protests have decided to fight their charges in criminal court.

Robert Birmingham, 22, Anthony Morris, 24, and  Khury Peterson-Smith, 29, join five other protesters in opposing charges of trespassing and unlawful assembly. Police arrested 141 protesters, though most were released after paying $50 fines.

The Boston Police Department and state troopers moved in on protesters around 1:30 a.m. Tuesday morning after the group refused to leave a second encampment they had established several hundred feet from their Dewey Square tent site on Monday afternoon while police focused on a standoff with protestors on the Charlestown Bridge.

Mayor Thomas Menino and the BPD made repeated requests via Twitter that the group break down the second encampment for fear of damaging the recently-replanted green space, while Occupy Boston protesters called for additional volunteers to surround the camp in preparation for the raid.