[tivert]

> Technically, how the narrative is established? What is the procedure?

> When several news organizations follow the same narrative in a coordinated manner, is it because their editors just advertently sense "the party line"? Or the are some meetings where they are instructed? Or some written instructions distributed among them?

In the US, I think it's mostly due to shared individual biases causing the organizations to coalesce around a "party line." IIRC, a large majority of journalists have personal beliefs that are for one party and against the other, and even a very strong sense of professionalism can't fully neutralize bias like that.