The FSB's ranks were further diluted when various factions split off from it in the aftermath of the Banzer dictatorship and the electoral upheavals of the 1978-80 period. Carlos Valverde Barberry eventually emerged as leader and was presidential candidate in 1980, but results were poor. Factionalism again dogged the movement and much of it was absorbed into the conservative Nationalist Democratic Action (founded by Banzer himself). The rump FSB again came to adopt more left-wing rhetoric as a party of opposition although it was eliminated from Congress at the 1989 election and gained no seats at the 1993 election.