Amazon's fulfillment center in Bessemer, Alabama, has become ground zero for the U.S. labor movement, with nearly 6,000 employees asked to vote on unionization by March 29.

Axios Re:Cap digs into what the Alabama situation means for Amazon, its workers and why it's happening now, with Alec MacGillis, author of the new book about Amazon called "Fulfillment, Winning and Losing in One-Click America."