Which of the following groups fought for an eight-hour workday and a limit on child labor

In 1869, the Noble and Holy Order of the Knights of Labor, which initially offered a more reasoned approach to solving labor problems, was established in Philadelphia. At its inception, the KOL comprised nine tailors whose leader was Uriah S. Stephens. The organization believed that its predecessors had failed by limiting membership; the Knights proposed to organize both skilled and unskilled workers in the same union and opened their doors to blacks and women. In its early years, the organization was highly secret since in many areas union members were summarily fired. The Knights developed ornate rituals, drawn from Freemasonry,* to govern their meetings. By the early 1880s, the group had emerged as a national force and had dropped its initial secrecy. They sought to include within their ranks everyone but doctors, bankers, lawyers, liquor producers and gamblers.

i think they came to washington to protest