Toyota is the target of a grievance filed with the NLRB office in Cincinnati. 

Some employees of Toyota's Buffalo plant filed the grievance Friday saying they were barred from distributing literature during break time to fellow employees.  The literature was to generate discussion about union organization.    

Toyota officials say they haven't seen the charges and can't comment, but confirm there's a policy against distribution of literature during work times and in work areas.    Employees say their break areas have been strategically placed in spots considered work areas, effectively banning the practice at all in the plant.

The plant, which employs more than a thousand people making engines and transmissions, is a non-union shop.