In the early 20th century many Rusyn immigrants from the Carpathian Mountains settled in Four Mile Run. Most came to work in Pittsburgh's steel industry, and the neighborhood was adjacent to a large steel mill of the Jones and Laughlin Steel Company.
In the early 20th century, many Rusyn immigrants from the mountainous regions of Eastern Europe settled in Four Mile Run, primarily seeking work in Pittsburgh's steel industry. The neighborhood's proximity to a major steel plant operated by the Jones and Laughlin Steel Company was a significant factor in its development.