Conversation so far:
who won the academy award for best actor in 1939
Spencer Tracy won the Academy Award for Best Actor in 1939 for the film Boys Town.
what is the film boys town about
Boys Town is a film based on Father Edward J. Flanagan's work with a group of underprivileged and delinquent boys in a home that he founded and named Boys Town.

Question: what character did tracy play
Self-contained rewrite: what character did spencer tracy play in the film boys town