WASHINGTON, May 7 (Reuters) - The Office of the U.S. Trade Representative has called for United States-Mexico-Canada Agreement panel to review a labor dispute at a facility operated by Atento Servicios in Pachuca de Soto, Hidalgo, Mexico, it said in a statement on Tuesday.

The move follows a U.S. request in January for Mexico to review whether workers at call centers in central Hidalgo state were being denied their association and collective bargaining rights. (Reporting by Susan Heavey, editing by David Ljunggren)