Last month, the International Brotherhood of Teamsters gathered to vote on a resolution to support Amazon workers, who have repeatedly voiced concerns over the company's working conditions, injury rates and physical demands of the job.

“The International Brotherhood of Teamsters recognizes that there is no clearer example of how America is failing the working class than Amazon,” according to a copy of the resolution obtained by CNBC. “From its start as a book retailer, Amazon has grown to become an e-commerce giant and has disrupted industry after industry and displaced hundreds of thousands of jobs.”

Bezos responded to critics of his trip into space earlier this week.

“Well, I say they are largely right. We have to do both," Bezos said in a CNN interview ahead of the journey, referencing the world's many urgent social crises. "We have lots of problems here on Earth and we have to work on those.”

Bezos went and returned from his 10-minute trip into outer space on Tuesday per BBC.

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