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The administrative body that would ordinarily investigate your misclassification and issue a judgment in your favor for unpaid overtime (plus additional fines and penalties pursuant to Labor Code 210) would be the Department of Labor Standards Enforcement.
To file a wage claim with the DLSE, visit this link: http://www.dir.ca.gov/dlse/howtofilewageclaim.htm
An individual who believes they have been misclassified as a contractor can also submit a form SS-8 to trigger a formal IRS review of their position to determine its appropriate status. See here for the form: http://www.irs.gov/file_source/pub/irs-pdf/fss8.pdf
If the IRS finds a misclassification, they retain the authority to impose additional fines and penalties.
It is generally wise for misclassified workers to file with both the IRS and DLSE, as each agency will serve a very different function in investigating the claim.
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