Four thousand workers at a North Carolina Amazon warehouse are voting February 10-15 on whether to unionize with Carolina Amazonians United for Solidarity & Empowerment. RDU1, in the town of Garner, outside Raleigh, would be the second unionized Amazon warehouse in the United States. It’s an ambitious campaign. The workers are organizing across racial and ethnic divides, through constant turnover, in deeply hostile terrain. At 2.4 percent, North Carolina’s union density is the lowest in the country.