user: Question: What is the smallest crowd size for away team Fitzroy?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '14.8 (92)', 'Richmond', '9.5 (59)', 'Arden Street Oval', 15000.0, '30 April 1949']
SQL:

assistant: SELECT MIN("Crowd") FROM "Table" WHERE "Away team" = 'Fitzroy';