There was both a civil suit (brought by five employees) and a criminal complaint brought by the DOJ. The criminal complaint was about a violation of antitrust law:
> On September 24, 2010, the United States Department of Justice Antitrust Division filed a complaint in the US District Court for the District of Columbia alleging violations of Section 1 of the Sherman Act. In US v. Adobe Systems Inc., et al., the Department of Justice alleged that Adobe, Apple, Google, Intel, Intuit, and Pixar had violated Section 1 of the Sherman Act by entering into a series of bilateral "No Cold Call" Agreements to prevent the recruitment of their employees...
https://en.wikipedia.org/wiki/High-Tech_Employee_Antitrust_L...