Workers at an Amazon warehouse on Staten Island in New York will join thousands of others as the strike against the retail giant continues.

Amazon delivery drivers and Starbucks baristas are on strike in a handful of U.S. cities as they seek to exert pressure on the two major companies to recognize them as unionized employees or to meet demands for an inaugural labor contract.

Why are Amazon and Starbucks workers striking over the holidays? “This is a time when both companies make a lot of money,” one expert said.

The Teamsters said the strike will begin Thursday at several facilities, including in New York City, Atlanta, California and Illinois.

Amazon has reached a settlement with the Occupational Safety and Health Administration (OSHA) over working conditions at the e-commerce giant’s facilities, the Labor Department announced Thursday. The settlement agreement resolves the worker safety watchdog’s cases against Amazon for ergonomic hazards and requires the company to take measures to protect workers from conditions that could lead

Amazon Teamsters are launching what they call “the largest strike against Amazon in U.S. history,” including at the Johnston and Fall River sites. They say the nationwide strike started at 6 a.m. this morning. We’ll have more details on @NBC10 at noon. pic.twitter.com/J9bdeEcAfO

The retail giant said it expected its operations to be largely unaffected by the strike of some drivers at contracting firms Amazon uses to deliver packages.

The sheer abundance of deals during the holiday season can get overwhelming. Amazon's guides help US customers navigate more than 100 product types.

Slowdowns could disrupt both holiday travel and Amazon shipping. The world's two richest men are linked to both possibilites.

The announcement came on the same day that workers at seven of Amazon's facilities walked off the job to protest unfair treatment of its employees.

The Teamsters union is launching a strike against Amazon at numerous locations across the country, including in Maspeth, Queens.