BATH, Maine (AP) – Navy shipbuilder Bath Iron Works has filed a complaint with the National Labor Relations Board, accusing its largest union of threatening workers who cross the picket line during an ongoing strike.

Machinists’ Local S6 warned that anyone who chooses to cross the pickets will be fined in the amount of wages earned after the strike is over. Leaders included harsh words for so-called scabs, quoting a Jack London poem suggesting scabs should be drowned of hung.

BIW President Dirk Lesko said he was disappointed about the “false and threatening statements” and said the company will ensure that workers’ rights are protected.