(CNN) A dozen college coaches, sports administrators and test administrators each pleaded not guilty to racketeering in federal court in Boston on Monday as part of the sprawling college admissions scandal.

Gordon Ernst, Donna Heinel, Laura Janke, Ali Khosroshahin, Mikaela Sanford, Steven Masera, Martin Fox, Igor Dvorskiy, Lisa "Niki" Williams, William Ferguson, Jorge Salcedo and Jovan Vavic each pleaded not guilty to racketeering during their arraignments.

Ernst, Khosroshahin, Janke, Vavic, Salcedo and Ferguson were college coaches. Heinel was the senior associate athletic director at USC. Williams and Dvorskiy were standardized test administrators. Masera and Sanford were employees of Key Worldwide Foundation, the company at the center of the alleged fraud. Fox was the president of a private tennis academy and camp in Houston.

The court hearing comes two weeks after prosecutors announced charges against 50 people accused of carrying out the largest college admissions fraud ever prosecuted in the United States.

Prosecutors said the defendants carried out a scheme to cheat on standardized tests and/or bribe college coaches, who then helped the prospective students gain admission to a university by falsely claiming the students were athletic recruits.

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