What did the Spanish government do?

In the 1980s, Felipe Gonzalez’s government made a botched attempt at combating ETA by setting up Anti-Terrorist Liberation Groups (GAL); essentially these were mercenaries charged with assassinating key members of the separatist organisation. However, 10 of the 28 people killed by the GAL between 1983-7 turned out to have nothing to do with ETA, which led to the jailing of some of those who had set up the death squads.