Three suspects have been identified by the organisation after months of work and several tip offs.
One well-known Co Donegal businessman is the target for the biggest investigation after claims of money laundering for a criminal gang network.
Dozens of innocent people have been caught up in that inquiry.
And two other investigations – separate from the main probe – are also underway.
“The main suspect is a a very big fish whose wealth appeared to have come from property and other investments but CAB believe it was a front for a large criminal gang,” said one source.
“He is well know in Co Donegal; in business and other circles he would be virtually a household name.”
Donegaldaily.com cannot give further details for legal reasons.
However the intense main CAB investigation has been ongoing for at least six months and involves a number of international business deals which investigators believe were an attempt to launder cash on behalf of crooks.
In the other two cases, similar allegations are being investigated – though the amounts of money involved are said to be less than the main case which involves tens of millions of euro.
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