A group of ride-hail and delivery drivers are suing to invalidate the California ballot measure approved in November that declared them independent contractors, the latest volley in the state’s yearslong struggle over whether gig workers are employees.

Tesla Inc. told employees that a California county health official has now signed off on safety measures the company took last week at its car plant as it restarted production in defiance of the area’s shutdown order.

Tesla Inc. is poised to increase production at its California car plant and is back in hiring mode, according to an internal e-mail sent days after the company wrapped up a record quarter of deliveries.

A committee of employees at Amazon.com’s recently opened Staten Island fulfillment center is going public with a unionization campaign, a fresh challenge to the e-commerce giant in a city where it plans to build a major new campus.