In an era of celebrities using their fame to push their political beliefs, no-one can quite live up to the example set by Paul Robeson.

Whether it was singing for the troops in the Spanish Civil War or taking a stand in the campaign against segregation, his enormous talent gave him a platform to express his views.

He was determined to stay a radical to the end despite the attempts to blacklist him.

Jeff Sparrow has written a biography of Paul Robeson called "No Way But This: In Search of Paul Robeson."