How else would you call companies that take the majority of all H1-Bs issued, then turn around and resell newly minted immigrants' services to other companies?

How else would you call companies that take the majority of all H1-Bs issued, then turn around and resell newly minted immigrants' services to other companies? There're a lot of companies of different sizes that legitimately bring foreigners to fill the gaps not filled by local workforce, but bodyshops named in GP's post aren't those companies.