Some construction workers in Bakersfield say disputes with the carpenters union have gone much too far. Crews working at renovations for Santa Barbara Business College say the facility manager was pushed down by men who barged into the site -- they believe the men were carpenters' union reps.

Facilities director Richard Young says the incident happened at about 2:00 p.m. on Monday. He filed a report with police, alleging he was assaulted.

The construction crew says their location at 5300 California Avenue has been the target of some of those "Shame On" signs that pop up around town. But they say those sign-workers were not the ones that showed up on Monday.

Young says the two, big men had gone directly into the construction site. The project manager says he told the men they had to leave, and one crew member started to escort one man out -- while Young escorted the other.

"As we were leaving, basically he had some nice words to say," Young told Eyewitness News. "Told me how he was going to plant me in the ground, beat me up, and all this childish stuff. And then at one time, he grabbed me and threw me against the wall."

Young says the man didn't realize the supervisor was just coming around the corner at that moment. Young and other crew members say carpenter union reps have been at the site before, and they think the incidents have escalated.

Young says the union has a "issues" with the framing and dry-wall contractors on the job. But, he says the union men do more than just try to convince the workers to join the union. "It's beyond that, it's harassment," says Young.

The project foreman says when the union reps were there before, spokesman Bill Mangum left his business card. Eyewitness News tried to reach Mangum.

We called the Los Angeles phone number on the card, but a woman who answered said he worked in Bakersfield. We went to the carpenters' union hall in downtown Bakersfield, but were told he worked in a different building across the parking lot.

Knocking on both doors for that building, no one answered. Calling the number in L.A. again, a woman gave us a Bakersfield phone number. No one answered that line, but we left a message.

The manager and foreman at the construction site on California Avenue say because the union reps had walked into the project before, they put up signs reading "no trespassing -- authorized personnel only."

Young says it's unacceptable that the union people still came deep into the project "..and began to harass workers and vandalize the interior."

Eyewitness News did reach a carpenters' union spokesman by phone in Los Angeles. Dan McDonald said their reps "always behave professionally." McDonald says he reached the local rep, Bill Mangum -- who told him there was "nothing like an assault."

We asked if any carpenters' union personnel had been at the 5300 California Avenue site on Monday -- but McDonald said he didn't know. Eyewitness News asked him to request that Mangum call us back, so we could pin that down.

As of Tuesday night, we have not heard from Mangum.

Bakersfield Police Sgt. Greg Terry confirms a report was filed on the Monday incident, alleging battery and assault. The project facilities director takes that very seriously.

"The individual knows who he is," says Richard Young. "I highly suggest he turn himself in -- because I'm not dropping this."

The crew says after the roughing up incident, they got photos of the cars and license plates of the men who went into the site.