What is ICE? Who are these men we see gathered around students and politicians in the US, with their faces covered, wearing unmarked clothing, often throwing people into unmarked cars? Where did this organisation originate? How did it turn into what looks like a militia? And where will its loyalties lie in future if there is a threat to Trump's hold on power?

This special edition of Origin Story looks into US Immigration and Customs Enforcement, a body which was once responsible for tracking undocumented immigrants who were a threat to national security, but has now metastasised into a group which seems to target all immigrants and many US citizens.

We track its birth under George Bush Jr, its actions under Barack Obama and then its radicalisation and expansion under Donald Trump. Then we peer into the alarming evidence about its behaviour and its part in Trump's broader agenda, before listing the comparisons with Nazi Germany. Everything you need to know about one of modern America's most disturbing developments.

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Written and presented by Dorian Lynskey and Ian Dunt. Produced by Simon Williams. Music by Jade Bailey. Art by Jim Parrett. Logo by Mischa Welsh. Group Editor: Andrew Harrison. Origin Story is a Podmasters production

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