During and after World War I, he photographed American Red Cross relief work in Europe. In the 1920s and early 1930s, Hine made a series of "work portraits," which emphasized the human contribution to modern industry. In 1930, Hine was commissioned to document the construction of the Empire State Building. He photographed the workers in precarious positions while they secured the steel framework of the structure, taking many of the same risks that the workers endured. To obtain the best vantage points, Hine was swung out in a specially-designed basket 1,000 ft above Fifth Avenue. At times, he remembered, he hung above the city with nothing below but "a sheer drop of nearly a quarter-mile."