Conversation so far:
What started Billy Southworth's career as a manager?
Southworth's managerial career began in 1928 with the Rochester Red Wings of the AA International League.
Was he a good manager there?
The team won the IL championship that season.
What was his strategy as a manager?
he attempted to impose discipline on the Cardinals.
Did he work with anyone of note?
CANNOTANSWER.
What other teams did he manager?
he quit a coaching job with the 1933 Giants.

Question: Why did he quit?
Self-contained rewrite: Why did Billy Southworth quit his coaching job with the 1933 Giants?