When hundreds of [Asian migrant] workers angered by low salaries and mistreatment rioted Tuesday night at the site of what is to become the world's tallest skyscraper...they offered a glimpse of an increasingly organized labor force...[T]he workers...live in a Dickensian world of cramped labor camps, low pay and increasing desperation...Of the 1.5 million residents of Dubai, as many as a million are immigrants who have come here to work in some capacity, with the largest subgroup being construction workers...[L]aborers have held at least eight major strikes to demand their rights and get their pay, which is sometimes withheld. But the mass action on Tuesday was the most significant of its kind...Unionizing is forbidden, too...Denial of wages is the most common abuse of workers...The U.A.E.'s Ministry of Labor has tried to tackle the problem in recent months...