Silicon Valley workers want to form a union, but unlike the cafeteria workers and security guards who won official recognition this summer, this time it’s the product designers, software engineers, and mid-level managers who are coming together to organize.

In an industry where power is concentrated in the hands of founders, investors and shareholders, workers from Google, Facebook and other tech giants hope that by pooling their voices, they can pressure their employers to make decisions based on more than just profits.

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William Gould, the former chair of the National Labor Relations Board, the government agency responsible for safeguarding employees’ right to organize, believes that dissent from individuals at a company may eventually reach executives, but without an organization to consolidate voices and collectively bargain, there’s no compulsion for an employer to discuss anything with them.

“[A tech workers union] is a worthy objective, of that there’s no doubt,’’ he said.