The red brick building at the corner of 
Third Avenue and First Street was one of
 many factories that supplied the barrels used 
 for flour. Called coopers, the skilled workers 
who made barrels pioneered a new role for labor 
in Minneapolis. When their wages were cut in 
1874 and a strike was broken, some of them 
formed a co-op. The idea spread, and by 1886 
two-thirds of the coopers at the falls belonged 
to shops owned and managed by the workers. 
They prospered until flour sacks replaced 
barrels after 1900.
Submitted by @changeup3