He was reported to have been responsible for an attack upon, and the ultimate death of, strike leader Louis Tikas during the Ludlow Massacre.

[3] His sister was Anna L. Fisher, a Red Cross worker in World War I and an advisor to Faisal I of Iraq.

[4] Karl Linderfelt enlisted in the Cavalry of the Colorado National Guard at the age of 21, after a life-long interest in the military, exemplified by several youth cadet groups.

Linderfelt was working as a mine guard in Cripple Creek at the time of the beginning of the 1913 Southern Colorado Coal Field strike.

Upon his persistent requests to General Chase, with whom he had worked in the Northern Coal Field Strikes, he served as the deputy sheriff at Ludlow for two weeks before the militia was called in.

Before the Colorado National Guard was called to the strikes, Linderfelt was involved in a battle centralized in Berwind Canyon.

By the time of official guard involvement Linderfelt commanded both deputy sheriffs, many of which had Baldwin-Felts affiliations, and National Guardsmen from the Berwind battle all as Company B. Linderfelt is described by the congressional testimony of Brewster, a University of Colorado law professor, as a brutal man who took pleasure in the spray of the machine gun over the colony.