Conversation so far:
When did Smith win his second national championship?
1993.
Are there any other interesting aspects about this article?
Dean Smith's 1992-93 squad featured George Lynch, Eric Montross, Brian Reese, Donald Williams, and Derrick Phelps.
Who did they win against?
the University of Michigan basketball scandal" and resulted in Michigan pulling down all of its banners and titles from that era.

Question: what was the scandal?
Self-contained rewrite: what was the scandal involving Dean Smith that resulted in Michigan pulling down some banners and titles?