Last week, a group of current and former Amazon workers in New York’s Staten Island accomplished what some of the biggest unions in the United States could not: they organized Amazon’s first successful union vote in the country.

The battle isn’t over yet: in a statement, Amazon said it is weighing whether to file objections.

But today, we speak to Chris Smalls, interim president of the newly-formed Amazon Labor Union, about how he sparked a movement that succeeded where others have failed — and where that movement is headed next.