Question

The Cleveland Massacre was?

Answer 1

The so-called Cleveland Massacre was the beginning of John D. Rockefeller's drive toward an oil monopoly, and it is considered one of his shrewdest operations. The fact that he carried out this campaign in the midst of the most unfortunate episode of his business career (the demise of the infamous South Improvement Company) truly shows just how focused and ruthless Rockefeller could be.

Source: http://www.pbs.org/wgbh/americanexperience/features/general-article/rockefellers-south/