Tilda Swinton and director Bong Joonho talk about class warfare, Margaret Thatcher and giant pigs as they explain how their 2013 collaboration, Snowpiercer, got made.

A ‘mildmannered man in a suit’ was how Bong Joonho’s script originally described the bureaucrat quelling an uprising in Snowpiercer, a postapocalyptic thriller set on a train. Swinton delighted in transforming the role into a sadistic monster, complete with dentures and furs.

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