The Revolutionary United Front (RUF) was a rebel group that operated in Sierra Leone during the 1990s. They were known for their brutal tactics, including amputations and executions, and their goal was to overthrow the government and gain control of the country's diamond mines. There are several synonyms that can be used to describe the RUF, including insurgent group, rebel force, guerrilla army, and revolutionary movement. Each of these terms highlights a different aspect of the RUF's activities and beliefs. However, regardless of the word used, the actions of the RUF remain heinous and barbaric, causing immense harm and devastation to the people of Sierra Leone.