Created in 1959 at the height of Francisco Franco's dictatorship, the ETA was blamed for hundreds of killings and kidnappings in its fight for an independent Basque homeland in northern Spain and southwest France.
Formed during the rule of Franco, the Basque separatist group ETA is blamed for the deaths of more than 800 people, with the violence peaking in the 1980s and 1990s.
It is the first time the central government has curtailed autonomy in the region since dictator Francisco Franco's repressive 1939-75 rule.
ETA has been fighting Spain for an independent Basque state since the 1950s.
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