From a reader:
My grandfather had Kipling’s collected works, which featured swastikas on the spines. See [here] for an example.
My wife’s great-aunt gave her a sampler she made in college in the early thirties: it, too, features a swastika.
So these symbols were abroad, like fasces, but, of course, without any fascist connotations.
OTOH, I don’t know of any hammer-and-sickle symbology predating the USSR. Sickles, so far as I know, would have reminded folks of the Grim Reaper, which — for most of us — has negative vibes.
Me: I basically agree with this, but I think it should be noted that the swastika was perceived as anti-Semitic pretty early in the 20th century. I know that Jewish groups implored WEB Du Bois to stop running a decorative swastika on the cover of Crisis as early as 1924. Du Bois refused.
Of course the history of the swastika symbol goes way back and its racist meaning is very recent.