For the better part of a year, Microsoft Corp. has failed to quell a small but persistent revolt by employees bent on forcing the company to sever business ties with Israel over its war in Gaza.

The world’s largest software maker has requested help from the Federal Bureau of Investigation in tracking protests, worked with local authorities to try and prevent them, flagged internal emails containing words like “Gaza” and deleted some internal posts about the protests, according to employees and documents reviewed by Bloomberg. Microsoft has also suspended and fired protesters for disrupting company events.

Despite those efforts, a steady trickle of employees, sometimes joined by outside supporters, continue to speak out in an escalating guerilla campaign of mass emails and noisy public de

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