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Hezbollah emerged during Lebanon’s civil war, which broke out in 1975 when long-simmering discontent over the large, armed Palestinian presence in the country reached a boiling point. Various Lebanese sectarian communities held different positions on the nature of the Palestinian challenge.
Under a 1943 political agreement, political power is divided among Lebanon’s predominant religious groups—a Sunni Muslim serves as prime minister, a Maronite Christian as president, and a Shiite Muslim as the speaker of Parliament. Tensions among these groups evolved into civil war as several factors upset the delicate balance. The Sunni population had grown with the arrival of Palestinian refugees in Lebanon, while Shiites felt increasingly marginalized by the ruling Christian minority. Amid the infighting, Israeli forces invaded southern Lebanon in 1978 and again in 1982 to expel Palestinian guerrilla fighters that used the region as their base to attack Israel.
A group of Shiites influenced by the theocratic government in Iran—the region’s major Shiite government, which came to power in 1979—took up arms against the Israeli occupation. Seeing an opportunity to expand its influence in Arab states, Iran and its Islamic Revolutionary Guard Corps (IRGC) provided funds and training to the budding militia, which adopted the name Hezbollah, meaning “The Party of God.” It earned a reputation for extremist militancy due to its frequent clashes with rival Shiite militias, such as the Amal Movement, and its attacks on foreign targets, including the 1983 suicide bombing of barracks housing U.S. and French troops in Beirut, in which more than three hundred people died. Hezbollah became a vital asset to Iran, bridging Shiite Arab-Persian divides as Tehran established proxies throughout the Middle East.
Hezbollah bills itself as a Shiite resistance movement, and it enshrined its ideology in a 1985 manifesto that vowed to expel Western powers from Lebanon, called for the destruction of the Israeli state, and pledged allegiance to Iran’s supreme leader. It also advocated an Iran-inspired Islamist regime, but emphasized that the Lebanese people should have the freedom of self-determination.
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Israel is Hezbollah’s main enemy, dating back to Israel’s occupation of southern Lebanon in 1978. Hezbollah has been blamed for attacks on Jewish and Israeli targets abroad, including the 1994 car bombings of a Jewish community center in Argentina, which killed eighty-five people, and the bombings of the Israeli Embassy in London. Even after Israel officially withdrew from southern Lebanon in 2000, it continued to clash with Hezbollah, especially in the disputed Shebaa Farms border zone. Periodic conflict between Hezbollah and Israeli forces escalated into a monthlong war in 2006, during which Hezbollah launched thousands of rockets into Israeli territory.
https://www.cfr.org/backgrounder/what-hezbollah
The common denominator is Israel's treatment of the Palestinians.
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