Will Smith's altercation with Chris Rock creates global controversy.
Smith wins Best Actor at Oscars but resigns from Academy. Incident may harm Smith's career for years.
The Hollywood Ten scandal of 1947 excluded communist sympathizers. Time will tell if Smith will be welcomed back.
Exiled individuals face challenges to return to entertainment industry.
Smith's apology tour follows the incident. Smith's career future remains uncertain.
Hollywood's history of blacklisting resurfaces. Smith's altercation becomes a global controversy.