The U.S. State Department has officially designated Yahya al-Sayyid Ibrahim Musa and Alaa Ali Ali Mohammed Al-Samahi as Specially Designated Global Terrorists. This decision was made under the authority of several Executive Orders aimed at targeting individuals associated with terrorism. Both individuals are recognized as leaders of Harakat Sawa'd Misr, a group whose assets have been previously blocked by the Secretary of State. The designation means their assets in the United States are frozen, but no prior notice of this action was given to them, as it was determined that such a notice could compromise the effectiveness of the restrictions.
Simple Explanation
The U.S. State Department has labeled two people, Yahya and Alaa, as bad guys who are not allowed to have their money in America because they are accused of leading a group that does harmful things. They didn't tell these people ahead of time because it might have messed up the plan to stop them.