In a special edition of HARDtalk Stephen Sackur looks back at some of the guests who have risked their personal freedom to disclose secret information. What motivates these whistleblowers?

This is a bonus episode from HARDtalk, a show that brings you in-depth, hard-hitting interviews with newsworthy personalities. For more episodes search for HARDtalk wherever your get your BBC podcasts.

This post was originally published on The Documentary Podcast.