BERKELEY, Calif. — Authorities erected an 8-foot chain-link fence to separate tree-sitting protesters occupying a University of California oak grove from more than 72,000 football fans expected to descend on campus Saturday. University officials said the barrier was necessary to keep both the fans and tree sitters safe as No. 12 Cal faces No. 15 Tennessee in the Bears’ home opener at Memorial Stadium. “We’re putting up the fence to try to prevent any altercation either before or after the game,” UC Berkeley police Assistant Chief Mitch Celaya said. An Alameda County judge denied a motion Thursday by protesters, who...