Loughlin and Giannulli were among 16 prominent parents indicted Tuesday on a charge of money laundering conspiracy.
The parents were arrested last month on a single charge of conspiracy to commit mail fraud and honest services mail fraud.
Loughlin and Giannulli are accused of paying $500,000 in bribes to get their daughters admitted to the University of Southern California as crew team recruits, even though neither of them played the sport.
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They have not publicly commented on the allegations.