SIAN was joined by anti-immigration activist and former Norwegian resistance fighter Erik Gjems-Onstad, and the leader of the Norwegian Patriots, Øyvind Heian in May 2009 for an anti-Islamism demonstration in Oslo. They were heavily outnumbered by counter-demonstrators. Tumyr also compared Muslim immigration to Norway with the Nazi invasion of Norway in 1940. In June 2009, SIAN was again joined by Heian for a demonstration in Oslo. The Blitz movement and the Red Party in turn held an illegal counter-demonstration, against what they called "Nazis and racists". Both demonstrations developed into minor street clashes.