Without the star power of Charlize Theron, it’s hard to imagine how the makers of “North Country” convinced Warner Brothers executives to fund their movie. After all, it turns on a federal judge’s interpretation of Rules 23 (a) (1) and (2) of the Federal Rules of Civil Procedure.

Yet to their credit, director Niki Caro and screenwriter Michael Seitzman accepted the challenge to make a two-hour film about Minnesota women mineworkers who in 1991 won the first certification of a class action for sexual harassment in the workplace.