A large group of Uber drivers gathered this afternoon to protest outside the car-hailing-app maker’s San Francisco headquarters.

Chanting “no respect, no work,” the drivers told AllThingsD they are protesting the way Uber treats them.

“They’re running a sweatshop with an app. They don’t have the balls to come down and talk to us. We’ve been here for two hours,” said Raj Alazzeh, a driver with SF Best Limo who is serving as the group’s spokesman.