The Free Japan movement dates back to February, 1944, when a report from Yenan announced the arrival of Susuku Okano, a member of the Japanese Communist Party. A Free Japan Committee, official named the Japanese People's Liberation Alliance, was active in Yenan.
In November 7, 1944, John K. Emmerson proposed the use of a "free Japan" movement in the war against Japan.
References
Free Japan Wikipedia(Text) CC BY-SA