Tim Bray, a top engineer and vice-president at Amazon, announced on Monday he is resigning “in dismay” over the company’s firing of employee activists who criticized working conditions amid the coronavirus pandemic.

Bray’s resignation comes as Amazon faces increased scrutiny and employee activism surrounding its internal response to coronavirus. Amazon workers on Friday participated in a nationwide sick-out to, claiming the company has failed to provide enough face masks for workers, did not implement regular temperature checks it promised at warehouses, and has refused to give workers paid sick leave protest working conditions and inadequate safety protections.