ANSWER:
Palestinian Liberation Organization set up bases in 'Southern Lebanon' to gain power in the Lebanese government.
Step-by-step explanation:
- Palestinian Liberation Organization was basically formed in the year of 1964.
- The organization had the motto of, liberation of Palestine.
- PLO is also known for representing Palestine in the United Nation.
- The founders of PLO are Arab League and Ahmad Shukeiri. So. this was the reason PLO setup bases in southern Lebanon.