Hundreds of Amazon drivers at a delivery station in Queens, New York, marched on their bosses today to announce they are joining the Teamsters. They are demanding the logistics giant recognize their union and negotiate a contract.

“To march today and walk in there with everyone behind us, all of us standing together as a union, it was so amazing,” said Latrice Shadae Johnson, who earns $20 an hour delivering packages for Amazon, where she has worked as a driver since last November.

What about Amazon’s managers? “They weren’t expecting it at all,” she said. “So when we walked in, they ran scared into a little hole, like a little corner that they could go around and they couldn’t be seen in. But we ran into the hole too!”