Google artificial intelligence (AI) researcher Margaret Mitchell has been locked out of corporate systems, making her the second outspoken critic at the company to be sidelined after colleague Timnit Gebru departed in acrimonious circumstances in December.

The Alphabet unit has an Ethical AI team, led by Mitchell, and a set of principles for developing the technology in a socially responsible manner. Gebru tweeted on Tuesday that Mitchell’s “corp access is now locked” and that the researcher had been told she would remain locked out “for at least a few days”...

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