He was one of the five founding members of the Military Committee, the other founding members were Hafez al-Assad, Salah Jadid, Ahmad al-Mir and Abd al-Karim al-Jundi, but acted as the committee's leading mind.[2] Umran was the committee's chairman until the 8th of March Revolution in 1963, and was the oldest committee member.[1] In the beginning, the Military Committee's goal was to rebuild the Ba'ath Party, which had been dissolved on the orders of Gamal Abdel Nasser when the United Arab Republic was founded, and establish a new party leadership.[3] During the UAR years, Umran and Jadid travelled the country and established contact with former party comrades, but without mentioning the existence of the Military Committee.[4] In the immediate aftermath of the UAR's dissolution, Umran contacted the other members of the Military Committee, and asked about the possibility of launching a coup to reestablish the union. He had outlined the political climate in Syria, and compared the strength of the Ba'ath Party against other political opponents – he reached the conclusion that a coup could be successful.[5]
Umran was a delegate at the 5th National Congress of the Ba'ath Party, and told Michel Aflaq of the Military Committee's intentions – Aflaq consented to a military coup to take power, but no agreement was made between him and the Military Committee on how to share power after seizing power.[6] Following the 8th of March Revolution in 1963 which brought the Syrian Regional Branch of the Ba'ath Party to power in Syria, Umran was first given the command of the 5th Brigade in Homs, but was promoted in June to become commander of the 70th Armoured Brigade.[7] Umran was appointed Deputy Prime Minister in the Salah al-Din al-Bitar's cabinet, the first Ba'athist government in Syrian history.[8]
After taking power, Umran became a member of the National Council for the Revolutionary Command (NCRC), the leading decision-making organ.[9] The organ was controlled more-or-less by the Military Committee and the Ba'ath Party's military wing, and important decisions were made without the collaboration of their civilian colleagues. After complaints from the civilian wing, Umran gave the civilian wing (represented by Aflaq, al-Bitar and Mansur al-Atrash among others) a faint idea of what the military leadership was up to.[9] Due to his allegiance to the civilian wing, he was stripped of his military title by the Military Committee and was appointed an ambassador in Spain, as a form of exile for dissidents.[10]
Umran was ousted from his position during the 1966 Syrian coup d'état by his former Military Committee comrades and was subsequently jailed in Mezzeh Prison. He was released following the 1967 Six-Day War with Israel, which ended in the latter's occupation of Syria's Golan Heights. Following his release, he fled to Lebanon.[11]