The security police were deployed extensively, combating the KPD's organized strikes and riots, including the Ruhr Uprising in the aftermath of the Kapp-Putsch in April 1920, the "Mitteldeutscher Aufstand" ("March Action") in March and April 1921, and the Hamburger Aufstand in October 1923, which were initiated in part by the KPD. From 1929 up to the ascension of the Nazi Party to power, the police were almost continuously engaged in operations protecting or dispersing demonstrations and political events.