Several hundred protesters gathered near a Broadway factory Wednesday to voice discontent over the hiring of non-union members to complete a plant expansion.

Union members say executives at LaFarge Gypsum, the company that owns the plant, broke an arrangement that swapped tax breaks in exchange for hiring local union members to expand the facility.

Members of the Building and Construction Trades Council say they?ve nearly been shut out of the $75 million expansion project for LaFarge, the world?s largest manufacturer of gypsum wall board. But LaFarge spokesman Gary Molchan says that?s not the case. Union members are active on the project, he insists.

The workers are also pushing for legislation that would make contracts that exchange tax breaks for union hires binding.

Should such a law pass, it may come too late to immediately benefit the union members. The LaFarge expansion is scheduled for completion in August.