The first word En learned when he began working at a construction site in Japan after moving from China was “baka,” Japanese for “idiot.” The 31-year-old farmer is one of 50,000 Chinese who signed up for a government-run program that promises foreigners the chance to earn money while acquiring valuable on-the-job training. Like many of his compatriots, he hoped to leave Japan with cash in his pocket and a new set of skills that would give him a better shot at work at home. “My Japanese colleagues would always say baka to me,” said En, who spoke only on condition that his full name not be revealed. “I am exhausted physically and mentally.” His problem is not the bullying by Japanese colleagues, nor the two-hour commute each-way or the mind-numbing work that largely consists of breaking apart old buildings. It is the ¥1 million he borrowed to take part in the Industrial Trainee and Technical Internship Program, ostensibly to cover traveling expenses and other “fees” charged by middlemen. The loan has left him a virtual slave to Japan’s labor-hungry construction industry. “I cannot go back before I make enough money to repay the debt,” he said. ... Japan’s top ally, the U.S., has even singled it out, with the State Department’s annual Trafficking in Persons Report for years slamming the program’s “deceptive recruitment practices.” ... Past allegations include unpaid overtime work, karoshi (death from overwork), and all kinds of harassment, including company managers restricting the use of toilets or demanding sexual services. The government rejects claims the program is abusive, yet acknowledges there have been some upstream problems. “It is true that some involved in the system have exploited it, but the government has acted against that,” an immigration official said. “It is not a system of slave labor.” The official insisted it was not in authorities’ power to control the behavior of middlemen but insisted they were not allowed to charge deposit fees. “It is also banned for employers to take away trainees’ passports,” he added. Prime Minister Shinzo Abe has unveiled a plan to expand the program that would allow foreign trainees to stay in Japan for five years instead of three, and says such labor will increasingly be needed, particularly in the construction boom ahead of the 2020 Tokyo Olympics. Abe is also aware that the nation’s health care sector must increasingly look abroad to fill the shortage of workers.