During the early 2010s, Fadel Chaker publicly voiced support for the Syrian opposition and denounced the government of Bashar al-Assad for its repression of civilians, particularly members of the Sunni community. Around this period, he became affiliated with the radical Islamist movement led by
Ahmed al-Assir. His alignment with al-Assir’s organization drew strong hostility from pro-Assad groups in Lebanon and Syria, including Alawite and Shiite factions sympathetic to the Syrian regime. In June 2013,
clashes broke out in an eastern suburb of
Sidon after several people attacked, threw stones and shattered windows in a car belonging to Ahmad al-Assir's brother, Amjad al-Assir. Ahmad al-Assir then gave Hezbollah a one-week ultimatum to vacate apartments occupied by the group's supporters in the mostly Sunni city containing heavy weapon in a civilian compound, as clashes broke out with gunmen wielding automatic rifles and rocket-propelled grenades. Officials stated that the gunmen fighting Assir's followers were believed to be Hezbollah sympathizers. On 23 June 2013, according to news channels loyal to Hezbollah, 10 Lebanese Army soldiers were killed and 35 wounded in a clash with armed men loyal to Assir, in Sidon at an Army post near the Abra complex that houses the Bilal bin Rabah Mosque. Other Lebanese news channels denied this and accused Hezbollah militias of being involved. Violence started with a deadly attack on an army checkpoint. Roads were later blocked in other parts of the country, and the army came under fire in the
Ain el-Hilweh camp. During 23–24 June 2013, heavy street fighting erupted between the Lebanese Army and gunmen loyal to Assir in Sidon. Sixteen Lebanese soldiers and more than twenty Assir supporters were killed. Although Shaker was later accused of involvement in the
2013 Sidon clash between Ahmad al-Assir’s group and the
Lebanese Army, Chaker has consistently denied any participation, asserting that he was falsely implicated due to his outspoken political and sectarian views. ==Trial and sentencing==