Sandinista National Liberation Front. The sandinista national liberation front (fsln) was established in nicaragua in 1961. Founded by josé carlos fonseca amador, silvio mayorga, and tomás borge martínez, it was originally a student organization based at the university of nicaragua in managua.

The party is named after augusto césar sandino who led the nicaraguan resistance against the united states occupation of nicaragua in the 1930s. Generally referred to by the initials fsln, the party took its name from the 1930s struggle of augusto césar sandino, a charismatic peasant leader who. The sandinista national liberation front (fsln) is a socialist political party in nicaragua.its members are called sandinistas in both english and spanish.