He switched labels on Carver 's peanut butter and his walnut spread so he would win the ribbon at the St. Louis World 's Fair .
Professor Waldo is George Washington Carver 's professional rival .
He switched labels on George Washington Carver 's peanut butter and his walnut spread so he would win the ribbon at the St. Louis World 's Fair .
Professor Waldo is George Washington Carver 's professional rival .