I read a book in the 90s about mind control, but can't remember the title or the author.
People start to commit extremely violent crime for no apparent reason. They claim that they had no control over their body when the crime was committed. Somebody who seems to be Russian-speaking is controlling them.
After being convicted of pretending to be controlled, the main hero ends up on an island where he discovers that the people in charge of the island are responsible for the chaos.
Russian scientists have invented a body controlling device. They used the device to escape the Soviet world. Now that renegade group is abusing the device and wrecking the entire world.
If I remember correctly the hero defeated the bad guys. However despite his initial promise, in the end he could not give up the high that the device gave him.
Any idea what is title of that book and who wrote it?