Agency-wide action follows initial walkout by 13 staffers.

Related stories:

• Persicope staffers walk off the job in protest of parent company.
• Periscope group strategy director Nathan Young teamed up with Bennett D. Bennett, principal and content lead at Aerialist, to draft a letter to agencies demanding action against systematic racism. 600 Black ad professionals signed the letter.
• Young and Bennett then created a nonprofit named 600 & Rising and secured a partnership with the 4A’s.

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