LB&B Associates - Naval Air Station Corpus Christi review: TimeCard Fraud

I am complaining anonymously in fear of retaliation from the company. I have witnessed the Site manager at LB&B Associates Naval Air Station Corpus Christi allowing Government contractors to commit time card fraud on U.S. Tax payers expense. There has been a company investigation with zero results or action taken. Who do I contact in the Federal Govt. to stop this waste of Tax dollars and fraudulent act?