was a short-lived leftist political party

Political party

A political party is a political organization that typically seeks to influence government policy, usually by nominating their own candidates and trying to seat them in political office. Parties participate in electoral campaigns, educational outreach or protest actions...

 in early Shōwa period

Showa period

The , or Shōwa era, is the period of Japanese history corresponding to the reign of the Shōwa Emperor, Hirohito, from December 25, 1926 through January 7, 1989.The Shōwa period was longer than the reign of any previous Japanese emperor...

 Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

.

The Nihon Musantō was founded by Suzuki Mosaburo

Suzuki Mosaburo

was a Japanese journalist, essayist, and socialist leader.He was born in Gamagori, Aichi Prefecture, to a family descended from medieval hatamoto; however, his father had lost the family's fortune, and as a result Suzuki was forced to work his way through school. He attended Waseda University and...

 and Kato Kanju in March 1937, as a political wing of the labor union movement. Kato Kanju (1892-1978), its chairman, won a seat in the 1937 general election, but the party failed to create much popular support against the rising forces of militarism

Militarism

Militarism is defined as: the belief or desire of a government or people that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests....

 and against the rising inflation in the Japanese economy.

In December 1937, its members were arrested in the Popular Front Incident, and the party was disbanded.