Identifying the Key Labor Organization of 1869

During the late 19th century, a series of labor movements emerged in response to the harsh conditions faced by workers in factories and mines. These movements sought to improve wages, reduce working hours, and enhance workplace safety. Among these movements, one organization gained notoriety for their strikes and efforts to unite workers across different trades.

Which labor organization was established in 1869 and played a significant role in advocating for the rights of workers across various industries, including the railroad and garment sectors?