(page 2 of 7) This colossal development is due to the efforts of a nearly invisible army, a group of almost two million migrant workers who drift from China's farmlands. Toting their bedrolls from work site to work site, they earn as little as 50 cents an hour. They work in a hazardous profession with practically no workplace protections and little or no medical coverage. Many of the workers live right in the heart of the city, yet few ordinary Beijing residents ever glimpse their crowded barracks, where privacy, cleanliness -- even meat -- are luxuries. They often get paid late or not at all. A report this year by the research arm of the State Council, China's highest administrative body, found that in 2004, construction firms in Beijing owed roughly 700,000 of their workers more than $380 million in wages. Mr. Wei is fighting to collect about $400 he says he is owed -- half his earnings last year -- and he may never see it. In such an uncertain environment, workers drift from job to job together. They rely on word of mouth to protect themselves against bad bosses. And, in bad times, they rely on each other. These men -- there are few women in their crews -- are working against a deadline: December 2007. That is when the bulk of the Olympic construction work must be completed so that Beijing, one of the world's most polluted cities, has time for the air to clear of construction dust before the Games begin. There is a lot to finish. The Olympics will attract a flood of foreign visitors and unprecedented media attention. Beijing's construction workers are aiming to have built a chunk of a subway system that, when completed, is projected to be the longest in the world, surpassing London's underground. They are erecting an airport terminal bigger than all five at London's Heathrow Airport and about 110 hotels. Including the suburbs of Beijing, the building binge could cost more than $180 billion. Some call it China's most ambitious construction project since the Great Wall. What happens to these workers after the boom already has become a topic of controversy. Beijing officials have made it clear they want to clear them out ahead of the Olympics. But authorities also fear political instability if so many workers are forced to leave because they may have trouble finding jobs back home.         PREVIOUS PAGE RETURN TO BIO NEXT PAGE