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Re:Google Walkout Organizers Say They're Facing Retaliation by azernik on Monday April 22, 2019 @03:30PM (#19722035)
That one is just the cliff notes. From the more detailed guidance at https://www.eeoc.gov/laws/guidance/retaliation-guidance.cfm#...:

"Depending on the circumstances, calling public attention to alleged discrimination may constitute reasonable opposition, provided that it is connected to an alleged violation of the EEO laws. Opposition may include even activities such as picketing."

i.e. direct labor action is considered part of the right to communicate grievances.

Re:Google Walkout Organizers Say They're Facing Retaliation by gojomo on Tuesday April 23, 2019 @04:02PM (#19732293)
Picketing on one's own time is still quite different than "not working during a normal workday". And now we're into situations where the particulars matter, as acknowledged by the more-tentative "may constitute" and "may include" phrasing of your new quote.

(There's probably better protection for their organizing and the walkout in labor-organizing law, rather than the non-discrimination/non-harassment statutes you're citing.)