Related Clues:

• Zeppo, for one
• 'Manifesto' writer
• See 48-Across
• See 10-Down
• Out-of-favor icon
• Manifesto writer
• Noted critic of capitalism
• Star of "A Night at the Opera"
• "Das Kapital" author
• 'Das Kapital' writer
• 'You Bet Your Life' emcee
• See 38-Down
• 'Das Kapital' author
• 'Animal Crackers' surname
• ''Duck Soup'' name