Yes. The Soviet Union was producing forgeries of some western currencies in the 1930s. This only came to light in the 1990s after the collapse of the Soviet Union.
As far as I recall, the serial number ranges of the forgeries are known from Soviet Union records.
The notes were distributed through many western countries and have turned up in bundles in the past.
I think they were more likely to have been a means of funding communist activity abroad in the 1930s, rather than any attempt to destabalise the US or any other economy.
The US Series of 1914 $100 forgeries have a small flaw on the reverse design which makes it possible to distinguish them from genuine notes. It has been a while since I looked at these, and I cannot recall where the design flaw is.
Grades range up to AU. There is published literature on these forgeries.
If you are interested, I can see if I can find an article I kept on the forgeries of the 1914 notes, though information on them should be available online. I also have an example of one of the forgeries, I might dig it out if I can find it.
Interestingly, many extant modern small size US 100 dollar notes up to 1990 were known to be forgeries, to the extent that the denomination was refused for exchange in many countries. The design dated from 1928 and had not been modernised since then. Microprinting was added after 1990, and the design was then replaced with modern notes later on.
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