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Max Pearson presents a collection of the week's Witness History episodes.

We hear about the era-defining book Subway Art and how Fight the Power became a protest anthem. Artist curator Marianne Vosloo explains how both street art and hip-hop are linked.

Plus, two stories from Georgia. Firstly, how Stalin carried out his most severe purge in Georgia in 1937, killing thousands of people, and then how after the breakup of the Soviet Union in 1991, the newly independent state was thrown into a political and economic crisis.

Finally, we hear from a former Canadian prime minister, on how her party was left with just two seats after the election in 1993.

Contributors:\nMartha Cooper and Henry Chalfant \u2013 authors of Subway Art.\nMarianne Vosloo - artist curator who works within the field of street art and urban art intervention.\nChuck D \u2013 Public Enemy frontman.\nLevan Pesvianidze \u2013 Georgian whose grandfather and uncle were both executed.\nLamara Vashakidze - a survivor of Georgia\u2019s crisis in 1991.\nKim Campbell \u2013 former Canadian prime minister.\nPreston Manning \u2013 founder and former leader of Reform.

(Photo: People queing to buy Subway Art. Credit: Jemal Countess/Getty Images)