Inside Story Americas - US guest workers: A captive workforce?

They were brought here as guests - but treated like slaves. That is the accusation being made by more than a dozen guest workers based in Pennsylvania, who on Thursday took their campaign to New York's Times Square. They are part of an estimated 100,000 students entering the United States each year on J class visas - a system that is intended to be part work and part cultural exchange but labour rights campaigners say that system is being exploited by companies looking for cheap labour.