He graduated with a degree in jurisprudence from Tokyo Imperial University and joined the Home Ministry, rising to the position of Vice Minister[1] pre-war.

[3] After the war, Nadao became one of the main people who pushed through the 1954 Police Law (as Minister of Health and Welfare at the time).

[4] He was also a member of the "Taiwan faction" of Japanese politics, influencing the foreign policy of Prime Minister Eisaku Satō.

[8] His stand against Nikkyoso was what he was known for within the Ministry of Education, and lumped him in with other members of the "education-public peace" or "law and order" clique,[7] or Bunkyo-chian zoku.

In 1968, he voiced his support for teaching children about the Emperor of Japan, his descent from the sun goddess Amaterasu, and the formation of the Japanese monarchy.