The 15. September Bewegung (English: 15th of September Movement, Kunikata: 9月15日事件, Kogatsu Jūgonichi Jiken, Hulstro-Mikun: Fūnfuzentā Seputenbā Būegūngu), commonly referred to as the Septembrist Movement or the Septembrists, named for the date of a peaceful protest march that ended in a bloodbath when regime forces opened fire on the protestors, was the united movement of the democratic opposition in Hulstria and Gao-Soto against the Imperial Socialist Party regime. A broad movement encompassing many social and political groups opposed to the dictatorship, such as the two main Hosian Churches, the Hosianisch-Demokratisches Verbund and several trade unions. It also enjoyed the support of the Crown Prince of Gao-Soto.