I dunno about the history of Austrian political parties, but this is very much true in Japan. The CIA constructed, financed, and ran intelligence operations for the ruling LDP party:
It’s covered at a greater extent in Tim Weiner’s Legacy of Ashes. Also, I find suspect the claim that you can be a CIA front organization for decades and then magically stop. This wasn’t even the full extent of the CIA’s meddling in Japanese politics. They also established control over their media through right-wing media magnates like Shoriki Matsutaro. This is documented in the CIA’s own archives.
https://www.nytimes.com/1994/10/09/world/cia-spent-millions-...