Why was Russell Sage a robber baron?

Russell Sage was considered a robber baron due to his ruthless business practices and monopolistic tactics in the railroad industry during the late 19th century. He amassed significant wealth by consolidating rail lines and engaging in questionable financial dealings, often prioritizing profit over ethical considerations. His influence extended beyond railroads, impacting various sectors, which contributed to his controversial reputation as a figure who exploited workers and competitors to achieve his financial goals.