A three-year undercover investigation into the world's most powerful gun lobby ended last year with an explosive report by Al Jazeera's investigative unit that revealed a link between the National Rifle Association and Australia's far right. Journalists from the unit walk us through how they got the story — which is the focus of a newly published book.

For more:

How to sell a massacre: NRA's playbook revealed

In this episode:

Peter Charley, executive producer for Al Jazeera's Investigative Unit; Al Jazeera senior producer Jeremy Young.

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