contracts that were one-sided - as in, a six month contract only meant that the H-1B was to work for six months, but the company could cancel the contract at any time.
I know this because, after I was "Reduction in Force"'d, I got a couple of contracts working there. Some of those H-1Bs would literally pack up all of their stuff on Friday, and waited to find out if they should report to work on Monday. My contract, and it was a contract with the same firms that hired the H-1Bs, because my H-1B manager just needed me to work there, and that was the easiest thing to do - was for six months, but got cancelled after three months. Only two people doing QA work on DSL at that point (in the US), and they decided to move all of it to India. The guy I worked with was H-1B, and we both were given the same notice.
This is why I laugh at the notion that H-1Bs contribute to the economy. A lot of them have no job security, share a contracting-company-leased apartment, share a contracting company leased car, skimp on meals, and send their money home. That money does not go into the local economy. Not saying right or wrong, but don't blow smoke up my butt telling me that the money stays here. The only entities that make money on a regular basis are the companies and the contracting firms. My company had the gall to complain that there were no more "friends and family" signups coming in - well, dumb-asses, when your contract workers' friends and family are overseas, there is no point in doing that.