Possible Clues:

• ''Grapes of Wrath'' surname
• "The Grapes of Wrath" name
• 'Grapes of Wrath' surname
• Family name in "The Grapes of Wrath"
• Family at the centre of Steinbeck's The Grapes of Wrath
• Steinbeck name
• Fictional Tom
• "The Grapes of Wrath" hero Tom
• Woody Guthrie's 'Tom ___'
• Subject of a Woody Guthrie ballad