From Karl Marx, The Poverty of Philosophy
In England… permanent combinations have been formed, trades unions, which serve as ramparts for the workers in their struggles with the employers... The organisation of these strikes, combinations, and trades unions went on simultaneously with the political struggles of the workers, who now constitute a large political party, under the name of Chartists.
The first attempt of workers to associate among themselves always takes place in the form of combinations.
Large-scale industry concentrates in one place a crowd of people unknown to one another.