Hundreds of Google workers and their supporters gathered near the company’s downtown San Francisco offices Thursday, raising signs that read “No Tech for Apartheid” and filling the air with chants of “Tech from Amazon and Google! You can’t claim that you are neutral!”

Similar scenes unfolded outside Google and Amazon offices in New York and Seattle, and a Google office in Durham, North Carolina. Google and Amazon employees were joined at the rallies by tech workers from other companies and Palestinian rights organizations. They all convened to protest Project Nimbus, Google and Amazon’s cloud computing contract with the Israeli government.