Questions: Which organization contained craft unions focused on improving wages and working conditions?

The answer is Samuel Gompers's American Federation of Labor.

The American Railway Union (ARU), led by Eugene Debs, was an industrial union that aimed to unite all railway workers, regardless of their specific trade or craft. It was not focused on craft unions but rather on organizing workers across the entire railway industry.

The Knights of Labor, led by Terence V. Powderly, was a broad-based labor organization that sought to include all workers, regardless of trade, skill level, or industry. It was not specifically a craft union organization, as it aimed for a more inclusive approach to labor organization.

The Industrial Workers of the World (IWW), led by Bill Haywood, was an industrial union that sought to organize all workers into one large union, regardless of trade or craft. The IWW was known for its radical approach and was not focused on craft unionism.

The American Federation of Labor (AFL), led by Samuel Gompers, was an organization that primarily consisted of craft unions. It focused on improving wages, working conditions, and other labor issues for skilled workers in specific trades. The AFL emphasized collective bargaining and was a key player in the labor movement for craft unions.