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This story is about the murder of a Philadelphia policeman in 1981, the man convicted of the crime, and the movement that has sprung up around him. The movement to free Mumia Abu-Jamal has developed an impressive worldwide following of celebrities, politicians, anti-death penalty crusaders, writers and others who believe he is innocent. 20/20's investigation finds that a close reading of trial transcripts, post-conviction relief hearing transcripts and numerous other documents and evidence reveals that the case to free Mumia is built on half-truths, misstatements, exaggeration and even false information.