The term "union bug" is frequently used to describe a minuscule union label appearing on printed materials, which supposedly resembles a small insect.
[1][2][3] The invention of the union label concept is attributed to the Carpenter's Eight-Hour League in San Francisco, California which adopted a stamp in 1869 for use on products produced by factories employing men on the eight- (as opposed to ten-) hour day.
In 1874, that city's unionized cigar-making workers created a similar "white labor" label to differentiate their cigars from those made by poorly paid, non-unionized Chinese workers.
By 1909, the American Federation of Labor had created its Union Label Department.
This article related to one or more trade or labor unions is a stub.