The first interstellar human state founded upon communist and revolutionary socialist principles, the Interstellar Socialist Republic had a brief but tumultuous history. After several hundred thousand Terran communists organized a self-imposed exile and colonization mission in the Carina Arm and Inner Centaurus regions, they established a socialist republic in 2415 composed of the various, widespread planets they settled. With monetary support from various political organizations, crowdfunding, and the occasional tacit support from Terran and Orionese governments, they built a mostly self-sufficient federation. However, it became mired in internal disputes over the direction it was supposed to take; this split the parliament between Maoist, Trostkyist, Leninist, Orthodox Marxist, and Post-Marxist factions for almost fifteen years, stalling its progress outside of the typical colonial expansion cycle. Even its flag was a point of dispute; original designs included a simple red flag, replaced with a red flag with variously gears, stars, sheaves, hammers, sickles, and other socialist iconography. Finally, the political fragmentation ended in 2429, when Neo-Leninist theorist and "red evangelist to the aliens" Connor Mackenzie became Secretary General of the federation; with his explicitly Leninist internal policies and attempts to reach out to the nearby alien governments that had recently adopted Mackenzieist communism, he forged a path that would lead to the unification of the ISR with the graal and tauran states to form an interstellar, multiracial communist federation, the Federative Republic of People's Solar Soviets. The ISR was renamed the Human People's Republic, as a signatory member of the FRPSS.
With his policies came the final version of the ISR flag, with an explicitly Soviet iconography. The flag of the FRPSS took clear cues from this design, including the "Chinese style" hammer and sickle as a nod to the majority Mandarin and Cantonese human settler population.