Hundreds of delivery drivers for e-commerce giant Amazon.com have joined the International Brotherhood of Teamsters, seeking improved wages, working conditions and safety standards, the labor union said on Monday.

Amazon has said in the past that it does not have enough control over drivers' working conditions to be considered their joint employer.

The National Labor Relations Board has issued a complaint against Amazon, accusing it of refusing to negotiate with Teamsters representing drivers in California employed by a contractor to the

Drivers at the facility, known as DBK4, have called for consistent schedules, properly maintained delivery trucks and reasonable workloads, the union said.

Amazon drivers across all eight of the company's Delivery Service Partners (DSPs) operating out of Amazon's DBK4 facility in Queens, N.Y., today formed a union with the Teamsters. In a "March on the Boss" rally,

The board had said in August that it had found merit to the union's claims that Amazon exerts control over BTS drivers and should be considered their employer under federal labor

Amazon hit with NLRB complaint after deriding finding that drivers are employees. The National Labor Relations Board (NLRB) has filed charges against Amazon, alleging that the e-commerce giant has illegally refused to bargain with a union representing drivers who are frustrated by what they claim are low wages and dangerous working conditions.