The Popular Front for the Liberation of Bahrain was an underground political party in Bahrain with origins in the Arab Nationalist Movement. Its members were inclined towards the leftist Marxist trend within the ANM. It was created after the Popular Front for the Liberation of Oman and the Arabian Gulf was reconstituted into two separate organizations as the Popular Front for the Liberation of Oman and the Popular Front for the Liberation of Bahrain. Several PFLB members participated in the Dhofar Rebellion in Oman. In 2000, PFLB members established the National Democratic Action Society, the first ever officially licensed political organization in any of the Arab states of the Persian Gulf. The PFLB was replaced by the NDAS.