Although at one point Sandy complains that he "got fired for no cause" (Chapter 22), the purported reason for his dismissal is because he apparently tried to form a union. In a conversation with his partner, J.J. Ford, Sandy straightforwardly admits to her that he "got fired from the Westing plant for trying to organize the union" (Chapter 14), and his own entry in the thumbnail sketches he keeps in his notebook about each of the heirs mentions this reason for his dismissal as well. The entry says,
"Alexander McSouthers...Called Sandy...Worked in Westing Paper plant 20 years... Fired by Sam Westing himself for trying to organize the workers...No pension" (Chapter 21).
Well Sandy was not fired from his job at the westing paper plant he made that up because in the end of the book you read that sandy was sam westing so sandy just made that up so no one suspected he was sam westing.
HE TRIED TO ORGANIZE THE UNION