Zachary Adam Chesser (born December 22, 1989) is an American convicted in 2010 for aiding al-Shabaab, which is aligned with al-Qaeda, and has been designated a terrorist organization by the U.S. government. After pleading guilty, Chesser was sentenced in federal court on February 24, 2011 to 25 years in prison. He is also known for his threats to South Park creators Trey Parker and Matt Stone for depicting Muhammad in an episode of that series.