The B-1 visa page indicates when you need a work permit. Also see the visa selector to choose the right permit, and the general FAQ-Frequently Asked Questions. These border problems can deeply involve corporate management. Employees are often needed in the U.S.A. quickly.
Delays can stymie business plans.
This revelation of an employee's background can trigger a reexamination of your relationship with him or her. These events can have deep personal significance to the employee. Invariably you will support the employee. This page helps you give this support. You can print it out for all of your employees traveling to the U.S.A. to prevent problems.