Students were allegedly admitted as students regardless of athletic ability, and received help cheating on entrance exams.
Academic officials, including the former women's soccer coach at Yale University are also facing charges.
Reports say up to $6 million has been paid in the bribes.
As reported by The Washington Post, authorities say Huffman paid $15,000 for a "third party to correct her daughter's answers on the SAT after she took it".
Loughlin and her husband, fashion entrepreneur Mossimo Giannuli, allegedly paid $500,000 to have their two daughters designated as members of the USC rowing team, even though they did not row. College coaches, administrators of the ACT and SAT exams and others were bribed in the scam, Lelling said.
Court documents unsealed on March 12 alleged that the individuals were involved in a nationwide conspiracy to facilitate cheating on college entrance exams and the admission of students to elite universities, including Yale and Stanford.
The case centers California businessman William Rick Singer, who took $25 million in bribes from parents in exchange for helping them gain acceptance to elite colleges and universities around country between 2011 and February 2019, according to The Associated Press.
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One of the cooperating witnesses is a founder of the non-profit Key Worldwide Foundation based in California and another worked as the director of college exam prep at a prep school and sports academy in Bradenton, Florida, according to the court papers.
There is no evidence the children were aware of the fraud, authorities said.
Prosecutors allege that other fake athletic profiles were also made to make students look like strong high school athletes when they actually weren't. The students also were not aware their admissions had been compromised.
According to CNN, Macy is not charged or named in court documents.
Loughlin and Huffman (as well as Macy) have yet to issue a statement or comment upon the charges.