The American Heritage Dictionary defines disinformation as "Deliberately misleading information announced publicly or leaked by a government or especially by an intelligence agency in order to influence public opinion or the government in another nation."
Source:
https://www.wordnik.com/words/disinformation
Take note of the fact that the AHD focuses on the fact that it is governments and their intelligence agencies who were first known for this type of thing. Now consider the fact that the U.S. government is gaining the power to throttle any ideas that run counter to the narratives that it spins.
Hmmm. The US government is trying to prevent Russian disinformation from being spread on US social media.
You seem to be quite the trusting soul when it comes to claims made by the U.S. government. Something for you to consider- might it be possible that the U.S. government might not be telling you the truth?