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Three armed members of the Croatian National Resistance hijacked Scandinavian Airlines System Flight 130 in an attempt to force the release of those arrested for the assassination of the Yugoslav ambassador the previous year.

Croatian National Resistance

Ustaše group in Spain (1955–1991)

The Croatian National Resistance, also referred to as Otpor, was an Ustaša organization founded in 1955 in Spain. The HNO ran an armed organisation, Drina, which continued to be active well into the 1970s.
Source: Wikipedia (CC BY-SA)

Scandinavian Airlines System Flight 130

1972 aircraft hijacking

Scandinavian Airlines System Flight 130 was an aircraft hijacking which took place in Sweden and subsequently in Spain on 15 and 16 September 1972. While en route from Torslanda Airport in Gothenburg to Stockholm Arlanda Airport, three armed members of the Croatian National…
Source: Wikipedia (CC BY-SA)

1971 Yugoslav Embassy shooting

Terrorist attack by Croatian separatists

The 1971 Yugoslav Embassy shooting was a terrorist attack carried out by Croatian separatists affiliated with the Ustaše movement. It occurred on 7 April 1971, at the embassy of the Socialist Federal Republic of Yugoslavia in Stockholm, Sweden. Among the victims was Vladimir…
Source: Wikipedia (CC BY-SA)