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In these circumstances, the CSC focuses on "the business case", the spokesperson said.

Hired guards are increasingly ubiquitous at college protests, with Apex and CSC contracted for security on campuses from Los Angeles to New York.

The university did not respond directly to questions about its relationships with Apex and CSC or the incidents with the firms on campus.

Several CSC guards are visible in the background of one of the videos.

Apex’s parent company, CSC, was founded in 1967 by Damon Zumwalt, then a student athlete at UCLA.