They were fascist.
And to top if off, despite the atrocities committed by the regime, they were pardoned under a 1977 amnesty law. There are people alive nowadays who tortured and murdered dissidents without having seen any justice so far.
Big mistake from Spain to let that go off so easily (the excuse was for a smooth and peaceful transition to democracy), they should've payed back for the White Terror (that vastly outnumbered the red Terror) during the Civil war, and arrest if not execute all the fascist scum. Now they gather freely as they want around Spain