Fake accounts on social media

There are hundreds of potentially fake accounts on Twitter and Facebook and Reddit which do nothing but re-tweet pro-Trump and anti-media messages all day, every day. They provide the graphics and slogans which hard core politically right folks in turn re-tweet to their followers. Who is actually behind these accounts? I also see political messaging on the left of course but usually those messages can be tied to a person who has written something non-political at least once in the past, but the hard right accounts are just creepy. Are they bots? Are they an army of poor in a 3rd world country being paid pennies on the tweet?