"On February 26, 2008, the Secretary of State designated al-Shabaab (aka al-Shabab, aka Shabaab, aka the Youth, aka Mujahidin al-Shabaab Movement, aka Mujahideen Youth Movement, aka Mujahidin Youth Movement, aka MYM, aka Harakat Shabab al-Mujahidin, aka Hizbul Shabaab, aka Hisb'ul Shabaab, aka al-Shabaab al-Islamiya, aka Youth Wing, aka al Shabaab al-Islaam, aka al-Shabaab al-Jihaad, aka the Unity of Islamic Youth) as a Foreign Terrorist Organization under Section 219 of the Immigration and Nationality Act (as amended) and as a Specially Designated Global Terrorist under Section 1(b) of Executive Order 13224 (as amended). The consequences of these designations include a prohibition against the provision of material support or resources to al-Shabaab and blocking of all property and interests in property of the organization that are in the United States, or come within the United States, or the control of U.S. persons. The Secretary of State took this action in consultation with the Attorney General and the Secretary of the Treasury. Designations play a critical role in our fight against terrorism and are an effective means of curtailing support for terrorist activities and pressuring groups to renounce terrorism."
United States. Dept. of State: http://www.state.gov/