The Knights of Labor had unparalleled efficiency in mobilizing their members. Because they could get thing moving so effectively, industrial reform was achieved in Richmond, Virginia.
The AFL's (later AFL-CIO) efficiency centers on regulations. They focus on quality over quantity. Chairman Ron Blackwell says the goal for regulations is that each "should be effective, efficient, as equitable as possible and sustainable."
The IWW distrusted any attempts by industry to improve "efficiency." They believed that anything which helped the corporation negatively impacted the worker, whether in longer hours, lower pay, or both.