Peace Preservation Law
The Peace Preservation Law of 1925 forbade both forming and belonging to any organization that proposed altering the "kokutai" or the abolishment of private property, effectively criminalizing socialism, communism, republicanism, democracy and other anti-Tenno ideologies. The Tokkō ("Special Higher Police") was established as a type of Thought Police to investigate political groups that might threaten Tenno-centered social order of Japan.