When you receive insider information about a company -- such as from an employee who works at the company -- and you make profitable transactions based on the insider information, you could be violating Securities and Exchange Commission laws. Specifically, you could be committing an insider trading violation.
A legitimate business can sometimes appear like a criminal operation to the federal government. For example, shell companies may be legitimate, but they also might be money laundering operations. The federal government may, therefore, pay scrutiny to the operations of a shell company for signs of illegal conduct.