The U.S. National Labor Relations Board (NLRB) has issued a complaint against commercial printing giant Quebecor World, alleging that the company engaged in unfair labour practices.

Quebecor World is alleged to have intimidated union organizing efforts at its plants in Corinth, Mississippi and Covington, Tennessee.

The Graphic Communications International Union (GCIU) complained to the NLRB that Quebecor fired a worker for refusing to spy on co-workers, threatened the jobs or transferred others who supported the organizing drive, and demoted an employee for union activities.

The NLRB alleged that Quebecor World violated the National Labor Relations Act by "interfering with, restraining and coercing employees."

GCIU organizing director Bert Haft called Quebec World's conduct "a pattern of coercion" and said the NLRB action shows that the labor board agrees.

Quebecor World issued a release late Thursday saying an NLRB complaint is not a finding of fault.

"Quebecor World is confident that when it is able to present evidence of its conduct before an Administrative Law Judge that it will be vindicated of the union allegations and found not to have engaged in any practice violating the law," the company said in a release.

The NLRB issues a formal complaint and sets a hearing before an administrative law judge when "after reviewing the evidence, it appears that a violation has occurred."

Quebecor World is Canada's largest commercial printer.