(CNN) Attorneys for several defendants in the college admissions scandal want the racketeering charges against their clients dismissed, saying they are unwarranted, new case filings show.

In the motion to dismiss her indictment, an attorney for Lisa "Niki" Williams says the "case is an unprecedented attempt by the government to prosecute various individuals."

She is being prosecuted with "crimes typically reserved for the mafia and drug cartels," attorney Eric Tennen said.

Attorneys for former University of Southern California water polo coach Jovan Vavic say their client is "a textbook example of prosecutorial overreach and frivolous use of RICO," according to a motion to dismiss his indictment.

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