February 13, 1979 - Anders Behring Breivik

The 2011 Norway attacks remain the deadliest act of domestic terrorism in Norway's postwar history, carried out in two coordinated strikes on a single day — a government quarter bombing followed by a methodical shooting at a youth political camp on Utøya that killed 69 people, most of them teenagers. What distinguishes Breivik's case beyond the death toll is the deliberateness of the planning: he spent years preparing, and left behind a lengthy manifesto framing the violence as a political act against perceived cultural change. His trial raised serious questions about the relationship between extreme ideology and criminal responsibility, ultimately concluding that ideology, not mental illness, was the operative force. The legal outcome — a sentence structured to extend indefinitely if he remains dangerous — reflects the challenge democratic systems face in responding to ideologically motivated mass violence without established precedent.

From Wikipedia

Anders Behring Breivik (born 13 February 1979) is a Norwegian neo-Nazi, mass murderer, and domestic terrorist who perpetrated the 2011 Norway attacks. A believer in the Great Replacement conspiracy theory, he sought to combat perceived "Cultural Marxism" by detonating a car bomb at the Regjeringskvartalet (executive government quarter) in Oslo, then carrying out a mass shooting at a summer camp of the Labour Party's youth wing on the island of Utøya, in total killing 77 people and injuring over 323.

Found competent to stand trial, Breivik was tried in 2012, convicted on all charges, and sentenced to the maximum civilian penalty of 21 years' imprisonment under preventive detention, extendable indefinitely if he is deemed a continuing danger.

At age 16, he was arrested for graffiti vandalism in Oslo. He later joined the anti-immigration Progress Party, chaired its Vest Oslo youth branch in 2002, and left in 2006. He joined a gun club in 2005. A company he founded later went bankrupt, and he reported no income in 2009. He financed the attacks with about €130,000 using credit cards.

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