- NGOs and CSOs the US has in China and their support of Civil Society; Civil Society is a comprehensive word that means signon to US standards, expectations, culture, economic norms, etc
- Source code (hosted on GitHub) that supports civil dissidents and websites (greatfirewall) that align with US narrative work that have US support or funding
- DoD MINERVA's study of housing crises in China and the possibility to use home ownership (surveillance of) for prediction or (propaganda of) nudging into unrest
- Broadcasting by the Board of Broadcasting Governors, such as VOA into China
- Anything you can find via FOIA requests from the Bureau of International Information Programs (this was born to take up responsibilities formerly in charge of by the late USIA)
If you want to get hypothetical there are number of suspicious events and coincidences - but these have no definitive link (smoking gun) pointing to the United States so they are excluded here.
It's important to note that NGOs do not mean that they are not related to government or the USG's national security objectives. ZunZuneo for example was set up through a series of NGOs that were ultimately CIA fronts.