A group of Amazon corporate employees is calling on colleagues to stage an "online walkout" to demand that the company reinstate fired workers, and to protest its treatment of warehouse workers during the coronavirus outbreak.

To participate in the walkout, slated for April 24, workers would all take a personal day off at the same time. It's being organized by employee advocacy group Amazon Employees for Climate Justice. Last week, Amazon fired two leaders of the group, Emily Cunningham and Maren Costa, who were previously user experience designers at the company and who have been outspoken critics of Amazon's climate stance and its labor policies.

Amazon said it fired Costa and Cunningham for "repeatedly violating internal policies." A spokesperson previously told CNBC that the company supports every employee's right to criticize their employer's working conditions, "but that does not come with blanket immunity against any and all internal policies."

Amazon Employees for Climate Justice announced the walkout during a virtual panel on Thursday. The panel was intended to spur dialogue between warehouse workers and nearly 400 Amazon tech workers on the call, the group said. Previously, Costa said Amazon attempted to intervene in the group's efforts to organize the panel by deleting invitations sent to other workers internally, which the group claims were accepted by more than 1,500 employees.

"We want to tell Amazon that we are sick of all this – sick of the firings, sick of the silencing, sick of pollution, sick of racism and sick of the climate crisis," Costa said during the panel. "We ask you to consider the stories that you've just heard, the deleted invitation to this event – is that okay with you, or would you rather be able to have this conversation, or the next conversation like it, openly?"

An Amazon spokesperson declined to comment on the walkout.