Amazon's high-stakes union vote ends, ballot counting begins: CNBC After Hours

CNBC.com's Pippa Stevens brings you the day's top business news headlines. On today's show, Deirdre Bosa lays out the stakes as Amazon's union battle in Alabama enters its final stretch. Plus Leslie Picker explains the $20 billion blowup in the stock market that started with a massive margin call to one client with brokers at multiple investment banks.