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I've seen consultants in Houston enticing Masters students or spouses of H1-B holders (holding some technology degree) with H1-B promises [Masters students on F1 visa are good targets, because they can work for 12 months if their Optional Practical Training (OPT) gets approved]. A company outsources projects to these consultants, and the consultants pay these people following any schedule they like. Someone I know was hired by one of these consultants, and then she managed to get a job offer with H1-B sponsoring. The consultancy created lot of problems when she tried to quit, and threatened all sorts of repercussions.