While there may not be many formal synonyms for the name Upton Beall Sinclair, there are several alternative ways to refer to the famous American author and activist. One common shorthand is simply "Upton Sinclair," though some fans and scholars may use his full name to emphasize his importance and legacy. Other possible synonyms might include "muckraker," a term that was sometimes used to describe Sinclair and other progressive journalists who exposed corruption and social injustice in the late 19th and early 20th centuries. Finally, one could also refer to Sinclair as a socialist or social reformer, given his passionate advocacy of workers' rights, public health, and democratic ideals.