May Day Parade, New York, 1910
Since today is May Day 2012 it seems appropriate to begin with this.
New York beauties at Atlantic City carnival, 1922
New York municipal lodging house, 1914
Parade of unemployed, 1909
Fresh air outing, 1913
Group of mainly female shirtwaist workers on strike, New York, 1910
Here's some info about the shirtwaist strike.
A shirtwaist was originally a separate blouse constructed like a shirt.
The most infamous disaster to strike sweatshop workers in the early 20th century was the fire at the Triangle Shirtwaist Factory, in 1911.
Immigrants in steerage, Friedrich der Grosse
Living on a skyscraper