Sayeedi is an Islamic scholar, politician, lecturer, and Chief of the the Jamaat-e-Islami, the largest Islamist party in Bangladesh. From 1996 to 2008, he was a member of the National Assembly of Bangladesh; he also served as Member of Parliament in 1996 and 2001. In 2009, Sayeedi was put on trial for war crimes during the Bangladesh Liberation War of 1971. He was handed a death sentence in 2013, a decision which led to violent protests. Many international observers doubted the impartiality of the trial, declaring it to be politically motivated.