The People’s Repuplic of Haven in the Honor Harrington series.
The ‘Com’ worlds in Jack Chalker’s Well World series.
Oh sure!
-Oceania is one
-or the Animal Farm
-the city in Zamyatyn’s (sp?) “We”
-Star Trek
-many of Stanilaw Lem’s very early works (which he doesn’t recognize anymore and prevents them from being published) are set in a future communistic society - like * Astronauts *, * The Magellan Cloud *, some of the earlier Ijon Tichy tales…
-the same is true for the Strugatsky brothers
The most important thing: in some of these, it actually works well!
Hence the “Fiction” in “Science Fiction”…
Then there are science fiction books that have the exploration of socialism as their goal…for example, either Ayn Rand’s “Anthem” or Lois Lowry’s “The Giver”, (for negative portrayals) or Edward Bellamy’s “Looking Backward” (for a positive one)
Is it? I know that STARFLEET members go without money, but I didn’t know if it was ever spelled out that all of the Federation (i.e., people not in military/research, for whom the govt. provides everything) worked that way.