Striking a blow at a Silicon Valley school that attracted foreigners with student visas, federal agents raided Sunnyvale's Herguan University and charged its CEO with visa fraud. The charges come a year after an investigation found Herguan was among a group of Bay Area schools that misrepresented information on federal applications, which allowed them to sponsor overseas students for coveted visas.

The Department of Justice and four states filed a multibillion-dollar fraud suit against the Education Management Corporation, the nation's second-largest for-profit college company, charging that it was not eligible for the $11 billion in state and federal financial aid it had received from July 2003 through June 2011.

The allegedly tainted Tri-Valley University might not be the only US educational institution to indulge in immigration fraud. Overseas education consultants from Andhra Pradesh who have details of educational institutions in the US note that more universities have been violating immigration rules while admitting students.