United States attorney Andrew Lelling said: "These parents are a catalogue of wealth and privilege".
"This case is about the widening corruption of elite college admissions through the steady application of wealth combined with fraud", Lelling said Tuesday.
Prosecutors have so far named 33 parents, 13 coaches, and associates of Singer's business.
Singer is scheduled to plead guilty on Tuesday in Boston federal court to charges, including racketeering, money laundering and obstruction of justice, according to court papers. According to the Los Angeles Times, the actress was taken into custody at about 6:00 am local time when Federal Bureau of Investigation agents showed up at her California home with guns drawn.
The alleged masterminds of the scam and the parents who paid into it could all face up to 20 years in prison if convicted.
The publication also reports Huffman was aware the arrest was set to happen and was set to "surrender on her own, but the feds saw it differently".
Loughlin returned home to Los Angeles Wednesday to surrender to US federal authorities.
The person told investigators the couple agreed to the plan.
Several colleges have already released their statements claiming they were "victims" of the bribery scheme, Fox News reported earlier.
One of the daughters, Olivia Gianulli, has become a prominent influencer on social media under the name "Olivia Jade".
"What we do is help the wealthiest families in the U.S. get their kids into school.my families want a guarantee", he allegedly said.
The colleges themselves are not targets, the prosecutor said.
Singer pleaded guilty and his lawyer, Donald Heller, said that his client intends to cooperate fully with prosecutors and is "remorseful and contrite, and wants to move on with his life".
How did the alleged scheme work?
The coaches worked at schools such as Yale University, Stanford University, Georgetown University, Wake Forest University, the University of Texas, the University of Southern California and the University of California, Los Angeles.
Mr Singer would agree with parents beforehand roughly what score they wanted the child to get.
Stanford's sailing coach John Vandemoer pleaded guilty Tuesday in Boston. Several of the coaches accused of accepting bribes have been fired, placed on leave or have resigned.
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