William Stephen Wright, known as King Rat, was a Northern Irish loyalist paramilitary leader who founded the Loyalist Volunteer Force (LVF) during The Troubles. Wright had joined the Ulster Volunteer Force (UVF) in his home town of Portadown around 1975. After spending several years in prison, he became a Protestant fundamentalist preacher. Wright resumed his UVF activities around 1986 and, in the early 1990s, replaced Robin Jackson as commander of that organisation's Mid-Ulster Brigade. According to the Royal Ulster Constabulary (RUC), Wright was involved in the sectarian killings of up to 20 Catholics but was never convicted for any.

The Loyalist Volunteer Force (LVF) was an Ulster loyalist paramilitary group in Northern Ireland. It was formed by Billy Wright in 1996 when he and his unit split from the Ulster Volunteer Force (UVF) after breaking its ceasefire. Most of its members came from the UVF's Mid-Ulster Brigade, which Wright had commanded. In a two-year period from August 1996, the LVF waged a paramilitary campaign in opposition to Irish republicanism and the Northern Ireland peace process. During this time it killed at least 14 people in gun and bomb attacks, almost all of them Catholic civilians killed at random. The LVF called off its campaign in August 1998 and decommissioned some of its weapons, but in the early 2000s a loyalist feud led to several killings. Since then, the LVF has been largely inactive, but its members are believed to have been involved in rioting and organized crime. In 2015, the security forces stated that the LVF "exists only as a criminal group" in Mid-Ulster and Antrim.