Which of the following is an example of an employer unfair labor practice? Kate, the union head, expels members for crossing a picket line that is unlawful. Jake, a manager, threatens to close down a plant if organized by a union. Rick, a manager, who prohibits mass picketing, when non-striking employees are physically barred from entering the plant. Ben, a union member, causes discharge of an employee, Jane, who spoke out against a contract proposed by the union.