A group of employees at the Hyatt Regency Waikiki has filed federal unfair labor practice charges against UniteHere! Local 5.

With assistance from the National Right to Work Foundation, a group of four employees filed the charges with the National Labor Relations Board, or NLRB.

The employees alleged that when the collective bargaining agreement expired in June 2010, they resigned their union membership and exercised their option to refrain from union dues payments.

They alleged that Local 5 is charging the workers for union dues and fees from June 2012 to August 2013, though the new Local 5 contract covering Hyatt workers that was approved in July 2013.

The national office of UNITE HERE at the time said the new agreement covered retroactive pay increases and maintenance of health care and pension benefits.

The National Right to Work Foundation identified the union employees who filed the charges as Mark Tamosiunas, Wayne Young, Steven Taono and Anges Demarke.

The foundation said the charges will be investigated by the NLRB.

Local 5 could not be immediately reached for comment.