As previously reported on BoxingScene.com, unified middleweight champion Gennady Golovkin accused Mexican superstar Saul "Canelo" Alvarez of being a longtime user of performance enhancing drugs.
Golovkin rejected Canelo's explanation for failing two tests back in February, which came up positive for banned substance clenbuterol.
The undefeated puncher does not believe Canelo came up positive due to contaminated meat, which is what the Mexican boxer and his team are claiming.
The two boxers are scheduled to collide in a rematch on May 5th, from the T-Mobile Arena in Las Vegas.
"I'm a clean athlete. After the first fight I knew he was not clean," Golovkin said to reporters. "Have a look at the pictures they post when he uses some pills. Let him explain what kind of pills they are."
Golovkin believes Canelo is being protected by officials in the city of Las Vegas.
The first bout, which also took place at the T-Mobile Arena in Las Vegas, ended in a controversial split draw.
According to Golovkin, if he would have tested positive for clenbuterol - instead of Canelo - the rematch would have likely been canceled by the Nevada State Athletic Commission.
"I don't think I would have had the same amount of benefits he has had," Golovkin said. "That's why I would never use any drugs because I know there won't be any preferences to me.
"I felt like I won the fight. I thought I didn't understand something but then I reviewed the fight. These people are like terrorists. They're killing sport. It's not about me. People like that should be in prison. People being cheated like that. It's too much. This is America. This is democracy."
Golovkin is backed by his trainer, Abel Sanchez, who also believes Canelo is given special treatment in Las Vegas.
"Going to Vegas we are two points down and we are gonna need to win more convincingly or to knock him out," Sanchez said.