Despite a prosecutor's report in August 2010, provided to ABC News by Morozov, that accused of Leschevsky committing a crime connected to him "personally accept[ing]... a large sum of money," no charges were brought.
Leschevsky denied the charges and continued to work in the government.
Now living in exile outside London, Morozov said he was told that the Mafia group in Sochi received the "order" to kill him.
He says the whole system is designed to make corruption possible.
"These are the criminals. This is what you in the West should understand."
The International Olympic Committee says the allegations of corruption are the responsibility of the Russian government, and outside its jurisdiction.
Moscow-based freelance journalist Patrick Reevell contributed to this report.