During the first years of the transition to democracy, FN's members were involved in supporting and perpetrating a number of terrorist incidents and murders against striking workers, left-wing politicians, trade unionists, journalists, and student organizations. Examples include the murder of 21-year-old
CNT member Jorge Caballero by ten members of
Fuerza Joven (FN's youth organization),
[4] the
Montejurra massacre, and several murders by the colluding
Guerrilleros de Cristo Rey.
[5] One of the most significant terrorist incidents supported by FN was the
1977 Atocha massacre, in which members of FN and the Guerrilleros de Cristo Rey assassinated labour activists affiliated with the
Communist Party of Spain; the attack, which was intended to spur a right wing coup d'état in the country, instead led to the arrest and sentencing of five FN affiliates to a collective 464 years in prison.