Series: Presidential Pardons White criminals seeking presidential pardons are nearly four times as likely to succeed as people of color, a ProPublica examination has found.

The case of Clarence Aaron gained national attention in 1999 when he appeared in "Snitch," a PBS "Frontline" documentary about prisoners serving long sentences after refusing to turn informant. The film helped him garner support in Congress and from civil rights organizations. Below are clips from the documentary. | Related story »