From http://skepdic.com/mindcont.html

Mind control is the successful control of the thoughts and actions of another without his or her consent. Generally, the term implies that the victim has given up some basic political, social, or religious beliefs and attitudes, and has been made to accept contrasting ideas. 'Brainwashing' is often used loosely to refer to being persuaded by propaganda.

There are many misconceptions about mind control. Some people consider mind control to include the efforts of parents to raise their children according to social, cultural, moral and personal standards. Some think it is mind control to use behavior modification techniques to change one’s own behavior, whether by self-discipline and autosuggestion or through workshops and clinics. Others think that advertising and sexual seduction are examples of mind control. Still others consider it mind control to give debilitating drugs to a woman in order to take advantage of her while she is drugged.

Some of the tactics of some recruiters for religious, spiritual, or New Age human potential groups are called mind control tactics. Many believe that terrorist kidnap victims who convert to or become sympathetic to their kidnapper's ideology are victims of mind control (the so-called Stockholm syndrome). Similarly, women who stay with abusive men are often seen as victims of mind control. Many consider subliminal messaging in Muzak, advertising, or on self-help tapes to be a form of mind control. Many also believe that it is mind control to use laser weapons, isotropic radiators, infrasound, non-nuclear electromagnetic pulse generators, or high-power microwave emitters to confuse or debilitate people. Many consider the "brainwashing" tactics (torture, sensory deprivation, etc.) of the Chinese during the Korean War and the alleged creation of zombies in Voodoo as attempts at mind control.

Finally, no one would doubt that it would be a clear case of mind control to be able to hypnotize or electronically program a person so that he or she would carry out your commands without being aware that you are controlling his or her behavior.

A term with such slack in its denotation is nearly useless. In narrowing down the denotation the first thing to do is eliminate as examples of mind control those activities where a person  freely chooses to engage in the behavior. Controlling one's thoughts and actions, whether by self-discipline or with the help of others, is an interesting and important topic, but it is not the same as brainwashing or programming people without their consent.

Using fear or force to manipulate or coerce people into doing what you want them to do should not be considered to be mind control. Inquisitions do not succeed in capturing the minds of their victims. As soon as the threat of punishment is lifted, the extorted beliefs vanish. You do not control the mind of someone who will escape from you the moment you turn your back.

To render a woman helpless by drugs so you can rape her is not mind control. Using a frequency generator to give people headaches or to disorient them is not the same as controlling them. You do not have control over a person's thoughts or actions just because you can do what you want to them or render them incapable of doing as they will. An essential component of mind control is that it involves controlling another person, not just putting them out of control or doing things to them over which they have no control.

Some of the more popular misconceptions of mind control originated in fiction, such as "The Manchurian Candidate." In that film, an assassin is programmed so that he will respond to a post-hypnotic trigger, commit a murder, and not remember it later. Other books and films portray hypnosis as a powerful tool, allowing the hypnotist to have his sexual way with beautiful women or to program her to become a robotic courier, assassin, etc. One such book even claims to be “based on a true story”: The Control of Candy Jones (Playboy Press, 1976) by Donald Bain. To be able to use hypnosis in this powerful way is little more than wishful thinking.

Other fictional fantasies have been created that show drugs or electronic devices, including brain implants, being used to control the behavior of people. It has, of course, been established that brain damage, hypnosis, drugs or electric stimulation to the brain or neural network can have a causal effect on thought, bodily movement, and behavior. However, the state of human knowledge on the effects of various chemical or electrical stimulation to the brain is so impoverished that it would be impossible using today's knowledge and technology to do anything approaching the kind of mind control accomplished in fantasy. We can do things that are predictable, such as cause loss of a specific memory or arousal of a specific desire, but we cannot do this in a way which is non-intrusive or which would have the significance of being able to control a large array of thoughts, movements, or actions. It is certainly conceivable that some day we may be able to build a device which, if implanted in the brain, would allow us to control thoughts and actions by controlling specific chemical or electrical stimuli. Such a device does not now exist nor could it exist given today's state of knowledge in the neurosciences. (However, two Emory University neuroscientists, Dr. Roy Bakay and Dr. Philip Kennedy, have developed an electronic brain implant that can be activated by thoughts and in turn can move a computer cursor.)*

There also seems to be a growing belief that the U.S. government, through its military branches or agencies such as the CIA, is using a number of horrible devices aimed at disrupting the brain. Laser weapons, isotropic radiators, infrasound, non-nuclear electromagnetic pulse generators, and high-power microwave emitters have been mentioned. It is known that government agencies have experimented on humans in mind control studies with and without the knowledge of their subjects (Scheflin 1978). The claims of those who believe they have been unwilling victims of "mind control" experiments should not be dismissed as impossible or even as improbable. Given past practice and the amoral nature of our military and intelligence agencies, such experiments are not implausible. However, these experimental weapons, which are aimed at disrupting brain processes, should not be considered mind control weapons. To confuse, disorient or otherwise debilitate a person through chemicals or electronically, is not to control that person. To make a person lose control of himself is not the same as gaining control over him. It is a near certainty that our government is not capable of controlling anyone's mind, though it is clear that many people in many governments lust after such power.

In any case, some of the claims made by those who believe they are being controlled by these electronic weapons do not seem plausible. For example, the belief that radio waves or microwaves can be used to cause a person to hear voices transmitted to him seems unlikely. We know that radio waves and waves of all kinds of frequencies are constantly going through our bodies. The reason we have to turn on the radio or TV to hear the sounds or see the pictures being transmitted through the air is because those devices have receivers which "translate" the waves into forms we can hear and see. What we know about hearing and vision makes it very unlikely that simply sending a signal to the brain that can be "translated" into sounds or pictures would cause a person to hear or see anything. Someday it may be possible to stimulate electronically or chemically a specific network of neurons to cause specific sounds or sights of the experimenter’s choosing to emerge in a person's consciousness. But this is not possible today. Even if it were possible, it would not necessarily follow that a person would obey a command to assassinate the president just because he heard a voice telling him to do so. Hearing voices is one thing. Feeling compelled to obey them is quite another. Not everyone has the faith of Abraham.

There seem to be a number of parallels between those who think they have been abducted by aliens and those who believe their minds are being controlled by CIA implants. So far, however, the "mind-controlled group" has not been able to find their John Mack, the Harvard psychiatrist who claims that the best explanation for alien abduction claims is that they are based on alien abduction experiences, not fantasies or delusions. A common complaint from the mind-controlled is that they can't get therapists to take them seriously. That is,  they say they can only find therapists who want to treat them for their delusions, not help them prove they're being controlled by their government. Thus, it is not likely that the "mind-controlled CIA zombies" will be accused of having delusions planted in them by therapists, as alien abductees have, since they claim they cannot get therapists to take their delusions seriously. In fact, many of them are convinced that their treatment as deluded persons is part of a conspiracy to cover-up the mind control experiments done on them. Some even believe that False Memory Syndrome is part of the conspiracy. They claim that the idea of false memories is a plot to keep people from taking seriously the claims of those who are now remembering that they were victims of mind control experiments at some time in the past. It is hard to believe that they cannot find a wide array of incompetent New Age therapists willing to take their claims seriously, if not willing to claim they have been victims of such experiments themselves.