Scode99 wroteHey Rolf
It works as the following:
Someone at the states (friend,relative or etc) that owns a shop lets say a carpenter want a specialist, a professional machine handler.
He invites his friend from Lebanon by a work visa and when he gets there he immediately starts work and gets his residence then gathers his family.
That is a myth. The work visa in the US is called H1B which has a limit per year.
Also it has a lot of requirements to be fulfilled by the employer. That is mainly the only type of work visa.