IN: Chicago is an American rock band formed in 1967 in Chicago, Illinois as The Chicago Transit Authority before shortening the name in 1970. The self-described "rock and roll band with horns" began as a politically charged, sometimes experimental, rock band and later moved to a predominantly softer sound, generating several hit ballads. The group had a steady stream of hits throughout the 1970s and 1980s. Since at least 2008, Billboard has shown Chicago to be the "greatest of all time" American band in singles chart success, and since 2015, the "greatest of all time" American band in album chart success as well.

The year 1978 began with a split with Guercio. Chicago had recorded its last five studio albums Chicago VI, VII, VIII, X, and XI, and had made two television specials at Guercio's Caribou Ranch. In later years, band members would cite Guercio's purchase of Caribou Ranch, more particularly their realization that Guercio had enough money to purchase Caribou Ranch, as a contributing factor to their disillusionment with him as a producer. They felt he had taken advantage of them financially. Then on January 23 of that same year, Kath died of an accidental, self-inflicted gunshot wound from a gun he thought was unloaded. Doc Severinsen, who was the bandleader for The Tonight Show Starring Johnny Carson at the time and a friend of the group, visited them after Kath's funeral and encouraged them to continue. According to writer Jim Jerome, the visit "snapped them back" and helped them make the decision to carry on.  After auditioning over 30 potential replacements for Kath, Chicago decided upon guitarist and singer-songwriter Donnie Dacus. While filming for the musical Hair, he joined the band in April 1978 just in time for the Hot Streets album. Its energetic lead-off single, "Alive Again", brought Chicago back to the Top 15; Pankow wrote it "originally as a love song but ultimately as recognition of Kath's guiding spirit shining down from above."  The 1978 album Hot Streets was produced by Phil Ramone. It was Chicago's first album with a title rather than a number; and was the band's first LP to have a picture of the band (shot by photographer Norman Seeff) featured prominently on the cover (with the ubiquitous logo downsized). These two moves were seen by many as indications that the band had changed following Kath's death. To a degree, the band returned to the old naming scheme on its subsequent releases, although most titles would now bear Arabic numerals rather than Roman numerals. Hot Streets, the band's 12th album, peaked at No. 12 on the Billboard charts; it was Chicago's first release since their debut to fail to make the Top 10. The release also marked a move somewhat away from the jazz-rock direction favored by Kath and towards more pop songs and ballads. Dacus stayed with the band through the 1979 album Chicago 13, and is also featured in a promotional video on the DVD included in the Rhino Records Chicago box set from 2003. Again produced by Ramone, it was the group's first studio album not to contain a Top 40 hit. Dacus departed from the band shortly after the album's release.
QUESTION: Who replaced him
IN: Rockefeller was the second of six children and eldest son born in Richford, New York to con artist William Avery "Bill" Rockefeller (November 13, 1810 - May 11, 1906) and Eliza Davison (September 12, 1813 - March 28, 1889). His siblings were Lucy (1838-1878), William Jr. (1841-1922), Mary (1843-1925) and twins Franklin (Frank) (1845-1917) and Frances (1845-1847). His father was of English and German descent while his mother was of Scots-Irish descent. Bill was first a lumberman and then a traveling salesman who identified himself as a "botanic physician" and sold elixirs.

The strike, called in September 1913 by the United Mine Workers, over the issue of union representation, was against coal mine operators in Huerfano and Las Animas counties of southern Colorado, where the majority of CF&I's coal and coke production was located. The strike was fought vigorously by the coal mine operators association and its steering committee, which included Welborn, president of CF&I, a spokesman for the coal operators. Rockefeller's operative, Lamont Montgomery Bowers, remained in the background. Few miners actually belonged to the union or participated in the strike call, but the majority honored it. Strikebreakers (called "scabs") were threatened and sometimes attacked. Both sides purchased substantial arms and ammunition. Striking miners were forced to abandon their homes in company towns and lived in tent cities erected by the union, such as the tent city at Ludlow, a railway stop north of Trinidad.  Under the protection of the National Guard, some miners returned to work and some strikebreakers, imported from the eastern coalfields, joined them as Guard troops protecting their movements. In February 1914, a substantial portion of the troops were withdrawn, but a large contingent remained at Ludlow. On April 20, 1914, a general fire-fight occurred between strikers and troops, which was antagonized by the troops and mine guards. The camp was burned, resulting in 15 women and children, who hid in tents at the camp, being burned to death. Costs to both mine operators and the union were high. This incident brought unwanted national attention to Colorado.  Due to reduced demand for coal, resulting from an economic downturn, many of CF&I's coal mines never reopened and many men were thrown out of work. The union was forced to discontinue strike benefits in February 1915. There was destitution in the coal fields. With the help of funds from the Rockefeller Foundation, relief programs were organized by the Colorado Committee on Unemployment and Relief. A state agency created by Governor Carlson, offered work to unemployed miners building roads and doing other useful projects.  The casualties suffered at Ludlow were successfully labeled a massacre and mobilized public opinion against the Rockefellers and the coal industry. The United States Commission on Industrial Relations conducted extensive hearings, singling out John D. Rockefeller Jr. and the Rockefellers' relationship with Bowers for special attention. Bowers was relieved of duty and Wellborn restored to control in 1915, then industrial relations improved. Rockefeller denied any responsibility and minimized the seriousness of the event. When testifying on the Ludlow Massacre, and asked what action he would have taken as Director, John D. Rockefeller stated, "I would have taken no action. I would have deplored the necessity which compelled the officers of the company to resort to such measures to supplement the State forces to maintain law and order." Rockefeller admitted that he had made no attempt to bring the militiamen to justice.
QUESTION:
What was the strike of 1913-14?