Frank Demers, left, of Auburn and Jason Stodder of Woolwich protest outside Bath Iron Works in Bath on Thursday.

Union members from Bath Iron Works rally in Bath on Thursday over what they say is an inappropriate attempt by the company to change the rules while there is an agreed-upon labor contract in place.

Bath Iron Works pipe fitter Dan Ouellette of Freeport holds a union sign while marching in protest of a proposal by the company to reclassify workers' jobs in Bath on Thursday.

An inflatable rat float sits outside the south entrance to Bath Iron Works, where union members gather to protest proposals by the company in Bath on Thursday.

Jay Wadleigh, president of the Local S6 chapter of the Industrial Union of Marine and Shipbuilding Workers of America, speaks to union members after marching from the Bath Iron Works south entrance in protest of a proposal by the company to reclassify workers' jobs in Bath on Thursday.

Jay Wadleigh, president of the Local S6 chapter of the Industrial Union of Marine and Shipbuilding Workers of America, speaks to union members at a rally in Bath on Thursday.

Union members from Bath Iron Works rally in Bath on Thursday. The union filed a lawsuit in April after it clashed with management at the General Dynamics-owned shipyard over worker classifications.

Union members from Bath Iron Works rally in Bath on Thursday.