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Bradley Birkenfeld served 30 months in prison for role in massive tax evasion scheme and remains under house arrest.
But few think the agency will have the same success it did with UBS.
Part 2: Feeding the UBS obsession with North American wealth.
Part 5: As whistle-blower is jailed, perpetrator of massive tax fraud gets backdoor bailout.
Part 3: Meet Bradley Birkenfeld's biggest client, and nemesis, US billionaire Igor Olenicoff.
Part 4: UBS whistle-blower pays a high price for tipping off US investigators.
Part 1: A UBS insider blows the whistle on Swiss banking.