Anders Breivik is a Norwegian far-right extremist responsible for the 2011 Norway attacks, which included a bombing in Oslo and a mass shooting at a Workers' Youth League camp on the island of Utøya. His actions resulted in the deaths of 77 people and were motivated by his anti-immigrant and anti-Islam beliefs. Breivik was arrested and later sentenced to 21 years in prison, a term that can be extended indefinitely as long as he is deemed a threat to society. His trial drew significant media attention and raised discussions about terrorism, extremism, and the impact of radical ideologies in Europe.