In 1979's Norma Rae, Field played the title role in the tale of a Southern mill worker's fight to unionise her workplace.

BBC: Sally Field and Daniel Day-Lewis

Tellingly, all votes held to unionise Wal-Mart stores have ended in failure.

ECONOMIST: A labour union's pyrrhic victory

Encountering American activist Sam (Adrien Brody) during one of his guerrilla-style stunts to raise awareness for the janitors' plight, Maya encourages her co-workers to unionise.

BBC: Loach's Bread winner

UFCW's efforts to unionise Wal-Mart workers in the United States.

ECONOMIST: A labour union's pyrrhic victory