JACKSON, Miss. — The State Department announced major changes Friday to its premier student-exchange program following an investigation by The Associated Press that found widespread abuses.

The agency issued new rules for the J-1 Summer Work and Travel Program, which brings more than 100,000 foreign college students to the United States each year.

The changes are the latest in a series of steps the State Department has taken to fix the program since the 2010 AP investigation. The investigation found that some participants were working in strip clubs, not always willingly, while others were put in living and working conditions they compared to indentured servitude.

In one of the worst cases of abuse, a woman told the AP she was beaten, raped and forced to work as a stripper in Detroit after being promised a job as a waitress in Virginia.

More common than sex-trade problems were shabby housing, hefty work hours and paltry pay. In August, dozens of workers protested conditions at a candy factory that packs Hershey chocolates in Hershey, Penn., complaining of hard physical labor and pay deductions for rent that often left them with little money.

Officials say the new rules limit the hours and jobs participants can work.

The J-1 program, created under the Fulbright-Hays Act of 1961, allows foreign college students to spend up to four months living and working in the U.S. It was meant to encourage cultural exchanges, but has become a multimillion-dollar international business.