A skilled worker is any worker who has special skill, training, knowledge which they can then apply to their work. A skilled worker may have learned their skills on the work experience, on-the-job training, an apprenticeship program or formal education. These skills often lead to better outcomes economically. The definition of a skilled worker has seen change throughout the 20th century, largely due to the industrial impact of the Great Depression and World War II. Further changes in globalisation have seen this definition shift further in Western countries, with many jobs moving from manufacturing based sectors to more advanced technical and service based roles. Examples of formal educated skilled labor include engineers, scientists, doctors and teachers, while examples of informal educated workers include crane operators, CDL truck drivers, machinists, drafters, plumbers, craftsmen, cooks and bookkeepers.
In the northern region of the United States, craft unions may have served as the catalyst to develop a strong solidarity in favor of skilled labor in the period of the Gilded Age (1865-1900).
In the early 1880s, the craft unions of skilled workers walked hand in hand with the Knights of Labor but the harmony did not last long and by 1885, the Knights' leadership became hostile to trade unions. The Knights argued that the specialization of industrialization had undermined the bargaining power of skilled labor. This was partly true in the 1880s but it had not yet made obsolete the existence of craft unionism.
The impact of scientific management upon skilled workers should not be overstressed, especially in the period before World War I.
The period between 1901 and 1925 signals the rise and fall of the Socialist Party of America which depended on skilled workers. In 1906, with the publication of The Jungle, the most popular voice of socialism in the early 20th century, Upton Sinclair gave them ignorant "...Negroes and the lowest foreigners —Greeks, Roumanians, Sicilians, and Slovaks" hell.