Federal corruption case names take the form of "United States v. [last name]" You can use both the databases Westlaw and Nexi Uni to search federal cases. It usually takes some scrolling to find the right case, particularly for common names. Finding out first when and where an official has been indicted and by what body (SEC, Federal SDNY, etc.) can help a lot with that scrolling..
News organizations often provide timelines of corruption cases you can find just by searching the web for their name and "corruption timeline."
