You can search for legal cases for a company by using the Company Search option. Then going to Legal in the left column. Narrow your results by searching for relevant terms such as "ethics" or "ethical".
After finding the company you are interested in (using the Company Search option), click on the Legal Issues link in the Left Column to browse. You may also want to narrow your search by going to the Limits tab on the top left corner.For example, here you can search for "ethics" and "violation" in the Limit by Keyword search box.