Kaitsepolitseiamet was first established on April 12, 1920. From 1925 to 1940 the institution was known as Political Police ("Poliitiline politsei", abbreviated "PolPol"). The PolPol fought against subversive activities of political extremists, espionage, desertion, smuggling and terrorism. The most discussed targets were the Estonian communists whose party had been declared an illegal organisation following the failed December coup, forcing them to operate clandestinely and through various legal fronts, usually as workers' organisations. Communists were supported by the Soviet Union, who had publicly accepted the principles not recognizing the parliamentary order, seeing terrorism as a legitimate activity. Similarly, the PolPol surveyed pro-Nazi oriented Baltic Germans and extreme monarchists of the White Russian emigres.