Those arrested were treated with extreme brutality.
It is well known that Takiji Kobayashi (1903-1933), an author of proletarian literature, was tortured to death.
One of the functions fulfilled by Tokko was immigration control of foreign nationals and management of affairs involving Koreans and other colonial subjects.
After World War II, many Tokko officers escaped banishment from public office and ended up working in immigration control services in various capacities, according to international law scholar Yasuaki Onuma (1946-2018), who authored Tan-itsu Minzoku Shakai no Shinwa wo Koete (Beyond the myth of monoethnic society).
Could this old Tokko mentality still linger among Japan s immigration officials today?