Tanzim Hurras al-Din, also known as the Guardians of Religion Organization, is a Sunni jihadist organization that was founded in February 2018 during the Syrian Civil War. After the al-Qaeda-affiliated Jabhat Fateh al-Sham dissociated itself from al-Qaeda and merged with other Islamic groups (Harakat Nour al-Din al-Zenki, Liwa al-Haqq, Jabhat Ansar al-Din, Jaysh al-Sunna, and parts of Ahrar ash-Sham) to form Tahrir al-Sham, general military commander Abu Humam al-Shami, leaders of the Khorasan Group, and al-Qaeda loyalists of the al-Nusra Front rejected the merger and formed Hurras al-Din. Hurras al-Din remained allied to the Turkistan Islamic Party, Ansar al-Tawhid, Ansar al-Islam, and other al-Qaeda-affiliated rebel groups while fighting against both pro-regime forces and Tahrir al-Sham (as well as the United States), and it came to have around 2,500 fighters by 2019. By the 2020s, Hurras al-Din was driven underground by an HTS crackdown, and it operated clandestinely in various parts of Syria and called for operations against forces of the Ba'athist regime, Russia, the United States, and Israel. The group served as al-Qaeda's branch in Syria after the dissolution of JFS, and senior al-Qaeda cadres from Afghanistan, Pakistan, and Iran came to Syria to support the group's foundation. While the group threatened any collaborators with ISIL with expulsion, ISIL sympathizers in the group allwoed for former ISIL fighters to join Hurras al-Din, and members of the group guarded Abu Bakr al-Baghdadi at the time of the Barisha raid in 2019.