The poster above may refer to the Japanese Communist Party, repressed under Hirohito, but legalized during U.S. occupation.
The Pacific War Photos of Pfc Glenn Eve is an archive collected by my father while assigned to the 4026th Army Signal Photo Battalion. Although he shot many of the images herein, the iconic ones were likely developed by him while working in the Mobile Photo Lab. I credit the original photographer where possible. You can read Pfc Eve’s whole story here.