The Labor Condition Petition (LCA) for H-1B Workers
Before you even apply for H-1B status, for example, you must be cleared by the US Department of Labor to make sure that your employment will not adversely affect US workers.
H-4 Visa Status for Dependents of H-1B workers
US immigration law allows the spouse and children of workers in H-1B status to enter and remain in the US on an H-4 visa