Syndicate features Utopia chips that the winning Syndicate installs after the first game; they make the people see the world as a paradise. It is the whole premise for Syndicate Wars, when the chips malfunction a bunch of people become religious zealots using them for brainwashing etc.
On a general level, I think the human mind is much easier to manipulate than is generally shown in science fiction due to our bias in believing in our own individuality. Already there have been devices like the god helmet (bad example but a popular one) which can incur, say, religious experiences in people. Using biochemical and electricity to manipulate brains directly wouldn't be a big change from that. I don't mean remote control, but more like incurring overpowering love and loyalty towards a certain person or faction. (Or overpowering animosity and hatred towards something else.) Perhaps remote control akin to piloting a drone might be possible, but what would be the point besides false flag operations? Actual drones/robots would do the same job better.
Personally, I think using such chips on a massive scale wouldn't be cost-efficient as mass media can achieve same result at less cost. However, I guess Evil Scientists might do so anyway Just Because, same for dictatorial madmen, strange cults and intelligence agencies. If cheap enough, they could be used for controlling prisoners or even "rehabilitating" them. (Forcing them to love everyone, whee!)
RE: Mi-go, it would make an interesting start, being a mi-go slave whose control fungi has died or something, allowing you to try and rebel/escape. Alternatively, being a Brain In A Jar inside a robot or something doing the same. Mi-Go should really get brain jars!