On July 20 she will become the oldest person ever to go to space when she takes part in the journey aboard the New Shepard launch vehicle along with Bezos.
The decision also "creates a potential monopoly for all future NASA exploration missions because there would not be continuing programs for lunar access other than the SpaceX solution," the protest said.
Amazon has defended its policies, engaging in heated debated with political leaders at times, saying that its investments offset taxes as intended by the tax code.
The US-based Forbes magazine has added 493 new billionaires to its 2021 list. Of these, 210 are from China, Hong Kong and 98 are from the United States.
"As President Biden points out, the best way for working people to protect themselves and their families is by organizing into unions," RWDSU head Stuart Appelbaum said in a statement.
Starting of the business as an internet bookseller 27 years ago, Bezos Amazon is now one of the world’s most valuable companies and posted three consecutive record profits after losses in decades prior.