Ministry of the Interior
From Gineipaedia, the Legend of Galactic Heroes wiki
The Ministry of the Interior was tasked with overseeing the internal political concerns of the Galactic Empire. (LOGH: 'Julian's Journey, Mankind's Journey')
History
Captain Christopf von Köfenhiller had originally worked in the Interior Ministry as the manager of a rural municipality before joining the Imperial Fleet. (SL: 'A Thread from the Past')
During the reign of Kaiser Reinhard von Lohengramm, a politician named Osmayer served as the minister of internal affairs, beginning in 799 UC (1 NIC / 490 IC / 3599 CE). (LOGH: 'The Kümmel Incident')
The Imperial Police was most likely subordinated to the Interior Ministry. (HBSHBL: 'The Night of the Party')