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Gordon Brown has led tributes to Nelson Mandela on his 90th Birthday. Writing on happybirthdaymandela .com the PM wrote -
"Nelson Mandela is a leader no prison cell, no intimidation, no threat could silence. A man whose belief in the future was so powerful that not even at 27 years behind bars and barbed wire could destroy his dream that millions could be free."
![Nelson Mandela speaks to Labour\](http://img.youtube.com/vi/u9YKdcvESLM/2.jpg "Nelson Mandela speaks to Labour\")
