The Public Company Accounting Oversight Board (PCAOB) was established after the issuance of the Sarbanes Oxley Act of 2002. This board was established by congress to oversee all the audits of public companies to make sure they report accurate and informative financial statements that are not fraudulent or misleading. The boards main goal is to protect the public's interest.
Here is a link to the Public Company Accounting Oversight Board (PCAOB)!