The operations involved transferring large amounts of money from company to company before exporting it through legitimate currency exchange companies.
But Andrew Peet, prosecuting, told Leicester Crown Court none of the gang had tax records which showed they had earned the sizeable amounts of money involved.
He said a police investigation called Operation Foam found the money came from criminal activities.
These included making bogus mortgage applications and forging one man’s identity to cash a £250,000 savings bond.
Mr Peet said: “This is a colossal and sophisticated enterprise where a web of companies was used to keep one step ahead of the authorities which wanted to know where the money came from.
“They took criminal money and laundered it through buffer accounts.
“We can prove for definite that £500,000 came from criminal activity.
“We maintain the remaining £9.5 million was also the result of criminal activity.”
Mr Peet told the jury that the principal figure in the operation, bankrupt businessman Mukhtiar Singh, had failed to attend court for the trial.
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