"He has used his fame, power and money to prey on those more vulnerable than him. This behaviour has been going on for decades," his older brother Randall Fowler said yesterday.
He also believes that more shocking revelations about his brother will be exposed soon. So far over a dozen men have come forward with sordid sex stories about Spacey. A couple of now grown men have told how they were abused or sexually harassed as teenagers, while others have told how they were sexually harassed by the Hollywood star in public places like bars and even in toilets of hotels.
"He sold out to fame and fortune, but the truth was always going to catch up with him. This is just the tip of the iceberg," says his brother.
We reported last week how Kevin Spacey's older brother had courageously opened up about how he was sexually abused by his own father.
He believes that living in such a house of horrors shaped Kevin into the "monster" he is today.
Randal says that Kevin "turned into a monster whose whole life was a lie".
Randall has told how they grew up with a paedophile father who was also a Nazi sympathiser who trimmed his moustache to look like his "hero" Adolf Hitler!
He says that his father Thomas Geoffrey Fowler raped him repeatedly throughout his adolescence.
"Neither of us had a chance growing up with two such damaged parents. I went through three marriages and 40 affairs," says Randall.
"There was so much darkness in our home it was beyond belief. It was absolutely miserable.
"Kevin tried to avoid what was going on by wrapping himself in an emotional bubble. He became very sly and smart.
"He was so determined to try to avoid the whippings that he just minded his Ps and Qs until there was nothing inside. He had no feelings."
Randall, who works as a Rod Stewart impersonator and limo driver, also reveals that his father was a Nazi sympathiser.
When Kevin Spacey was just a young boy his clearly mentally unstable father joined the American Nazi Party and even trimmed his mustache to resemble his "hero" Adolf Hitler.
Randall says he was just 12-years-old the first time his father sexually abused him. "He unbuttoned my pants and started playing with me," he recounts.
He remembers yelling out for his mother. "She came right up and pounded on the door but Dad had locked it and he told me to keep quiet. All of a sudden the pounding stopped. Mom had left. I'd never felt so abandoned. Dad started to perform a sex act on me. That was the beginning of my adolescence."
In an exclusive interview with the Daily Mail, Randal went into details about the horrifying ordeal and paints a picture of growing up in what can only be described as a house of horrors.
Randall says that he managed to stop his father from raping his younger brother Kevin. "I constantly threatened my father that if he ever touched my brother, I'd confront my mother with what was going on and that would destroy the family," he says.