Are the Men-in-Black real?

Experienced UFO researcher John A. Keel set forth his opinion that the MIB were "the intelligence arm of a large and possibly hostile group."

The following is an excerpt from "Real Aliens, Space Beings, and Creatures from Other Worlds" by Brad Steiger.

The MIB Phenomenon Begins with Bender in 1953 the prototype of what has come to be known in UFO research as the men-in-black (MIB) phenomenon began with the alleged silencing of Albert K. Bender in September 1953. According to the late Gray Barker, who wrote They Knew Too Much about Flying Saucers about the case in 1962, Bender had received data convincing him that he had been given remarkable insights into the truth about the origin of flying saucers. He wrote his thesis, then sent the report to a trusted friend. When three men appeared at his door, one of them supposedly held that letter in his hand.

Bender later told his friends that the three men were "pretty rough with him." He was informed that if people were to learn the actual truth about flying saucers, there would be dramatic changes in all things. Science, especially, would suffer a major blow. Political structures would topple. Mass confusion would reign. 

In June 1967 two of Bender's closest friends, Dominick Lucchesi and August C. Roberts, said that Bender had seemed to be a changed man after the three MIB had visited him. "He was scared, and he later suffered from tremendous headaches which he said were controlled by `them'." Roberts said that Bender dropped all UFO research and went underground, although they knew he was living under another name and managing a motel somewhere in California. 

Experienced UFO researcher John A. Keel set forth his opinion that the MIB were "the intelligence arm of a large and possibly hostile group." Keel said that he considered the UFO silencers to be professional terrorists assigned the mission of harassing UFO researchers who became highly involved in investigations that might reveal too much of the truth. Keel said that in his own research he had uncovered some extreme cases of personal abuse in which certain UFO contactees and/or UFO investigators had been kidnapped by three men in a black car. "For some reason," Keel noted, "it is almost always three men." He reports that they subject their victim to some sort of brainwashing that leaves him or her in a state of nausea, mental confusion, or even amnesia—and the condition can last for several days.

You can read more by purchasing "Real Aliens, Space Beings, and Creatures from Other Worlds" by Brad Steiger here.