TEWKSBURY — As the corporate shakeup within Market Basket continues to unfold, some divisions are visible within the company’s corporate offices as some employees report tension in the Tewksbury headquarters, and others report an improved company culture.

After May 28, when Market Basket CEO Arthur T. Demoulas and several other perceived allies of his were suspended by the company’s board of directors, little information about morale within the offices had come out publicly from employees still working there. That changed when Store Operations Manager Valerie Polito, a 35-year employee of the chain, penned a letter on behalf of a group of Market Basket associates describing a new culture “defined by fear, hostility and a lack of direction.”

On Aug. 8, a day after the letter became public

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