The One Big Union was an idea in the late 19th and early 20th centuries amongst trade unionists to unite the interests of workers and offer solutions to all labour problems. Unions initially organized as craft unions. Workers were organized by their skill: carpenters, plumbers, bricklayers, each into their respective unions. Capitalists could often divide craft unionists along these lines in demarcation disputes. As capitalist enterprises and state bureaucracies became more centralized and larger, some workers felt that their institutions needed to become similarly large. A simultaneous disenchantment with the perceived weakness of craft unions caused many unions to organize along industrial lines. The idea of the "one big union" is championed by anarchist syndicalists to organize effectiv