A badge of shame, also a symbol of shame, mark of shame, or simply a stigma, is typically a distinctive symbol required to be worn by a specific group or an individual for the purpose of public humiliation, ostracism, or persecution.
Under the Poor Law Act of 1697, paupers in receipt of parish relief
were required to wear a badge of blue or red cloth on the shoulder of
the right sleeve in an open and visible manner, in order to make life
more humiliating for the poor. The yellow badge that Jews were required to wear in parts of Europe during the Middle Ages, and later in Nazi Germany and German-occupied Europe, was intended to be a badge of shame. The term may also refer to other identifying marks that are associated with shame. The biblical "Mark of Cain" can be interpreted as synonymous with a badge of shame.
The term is also used metaphorically, especially in a pejorative sense,
to characterize something associated with a person or group as
shameful. via: wikapedia
Group of polygamists in the Utah Penitentiary, 8 men standing in prison stripes. 1885