If you look up "troll farm" online you'll find an abundant amount of investigative journalism from every corner of the global press about this phenomenon. Intelligence agencies and corporations make good use of troll farms in a myriad of ways. The purpose of a troll farm is to use social media and other platforms, mostly online, to influence political campaigns and the opinions of groups of people as well as individuals, employing psy ops tactics meant to harass, intimidate, insult, demean, spread false rumors, lie outright, disclose home addresses of targeted individuals, and a multitude of other related activities.
The troll farmers make excellent use of the idiosyncrasies of social media platforms -- especially Twitter -- to sow discord and doubt, to assign blame, to try to divide groups and movements, causing them to implode if possible. Troll campaigns target specific individuals or groups to try to destroy their careers or lives -- campaigns that frequently lead to serious emotional problems for the victims, and occasionally suicide. This is all well-known to regular media consumers.
Those who engage in these sorts of campaigns, whether they are organizers of the campaign or just willing (or even unwitting "volunteer") participants, are often referred to by phrases like Cancel Culture. Cancellation of those who are deemed to be worthy of their campaigns is the goal -- getting events cancelled, concerts cancelled, causing schisms either way, whether they succeed in their cancellation effort or not. The trolls like to say that the phenomenon they are engaging in doesn't exist (organized cancellation campaigns as well as "volunteer" cancel culture), and they say they are pursuing a practice called "deplatforming." It's exactly the same thing, with a different name.
Although there are many inherently toxic aspects to the internet, and specifically algorithm-driven corporate social media platforms full of largely anonymous actors, the organized cancellation campaigns carried out by the troll farms are the single most toxic thing that ever happens on the internet.
The Rand Corporation has done a study of the tactics of the disinformation campaigns carried out by the troll farmers of China and Russia. This graph they came up with is very handy, because it precisely describes the techniques used by the "antifascist" troll farmers in Portland, and all of the other organized cancellation campaigners as well, if they've studied psy ops techniques.