During the Civil War in Finland, Kallio hid in Red-dominated Helsinki, because he was at least nominally on the White side and therefore a "class enemy"; he formed a new senate (government) in Helsinki after German troops had defeated the Reds in the city.
Selama Perang Saudara Finlandia, ia bersembunyi di Helsinki yang didominasi merah, karena setidaknya ia nominal di sisi putih dan kemudian "musuh kelas"; ia membentuk senat baru di Helsinki setelah pasukan Jerman telah mengalahkan pihak merah di kota itu.