Web search says that contrary to stereotypes, the problem was that they did NOT have contractor staffing agencies, and that as a result, they were not withholding taxes. This was resolved by bringing in a staffing agency.

A second problem was that they DID have ambiguous language in their employee handbooks, which meant that once temps were ruled employees, they became benefit-eligible, including in retroactively.

https://www.reuters.com/article/businesspropicks-us-findlaw-...