Not official. But it is vague.
Basically, public pressure on friends family and employers to cut ties with someone due to a perceived offense or transgression. Not an act of government. And, actually, I have some sympathy for companies who cut someone loose due to publicity issues.
For an example, I will refer back to my earlier post:
https://www.goodmorningamerica.com/living/story/canceled-destroyed-life-68311913
Natasha Tynes saw a metro worker, in uniform, eating on the train. The context is that metro does not allow eating on the trains and enforces this rule for riders. So she tweeted (with a picture):
Natasha is a Jordanian-American writer. The metra employee in question was a black woman.
For whatever reason, someone on twitter decided that the tweet was because the woman was black, not because she was a metra employee doing something that they don't allow passengers to do. She lost her book deal, got death threats, etc. I think she even moved back to Jordan for a while.
How fast did this happen?
The tweet was The morning of May 10, 2019. Her publisher tweeted around 7:30 that same evening that they were cancelling her book.
I'll ask again, was justice served?
You can't have free speech and not have cancelling or other mob actions. At least not in the era of social media. (I think Black Mirror has sort of addressed this.) But at least we can acknowledge that sometimes the mob gets it wrong.