With headquarters moved to Beirut, PLO factions recruited new members from the Palestinian refugee camps.[5] South Lebanon was nicknamed "Fatahland" due to the predominance there of Yasser Arafat's Fatah organization. With its own army operating freely in Lebanon, the PLO had created a state within a state.[6] By 1975, more than 300,000 Palestinian displaced persons lived in Lebanon.[7] Aside being used as an operation base for raids on Israel and against Israeli institutions across the world, the PLO and other Palestinian militant organizations also began a series of airplane hijack operations, targeting Israeli and international flights, carrying Israelis and Jews. The more profound effect on Lebanon was destabilization and increasing sectarian strife, which would eventually deteriorate into a full-blown civil war.