His views grew more radical and he took part in violent riots on the vegetable market in 1918. The Easter Crisis of 1920 when king Christian X dismissed the cabinet of Carl Theodor Zahle became a turning point for Larsen. During the crisis, Larsen spoke in public on City Hall Square in Copenhagen. While parts of the Social Democratic Party supported the abolition of the Danish monarchy, the social democrats and the Danish Confederation of Trade Unions accepted a compromise and the crisis was called off. This compromise disappointed Larsen, and the following month he left the Social Democratic Party and joined the newly formed Left Socialist Party.