In the United States 100 years ago, there was a real political concern about the spread of socialist revolution, with labor unions in the center of that. There was a premeditated action through politics and business in the USA to remove socialist union leadership, and build strong hierarchical management that was politically predictable. Many of the eager candidates for this kind of structure were Mafia-connected. When actual organized crime had the opportunity, multiple family fortunes were built on control of Unions. This is very well documented but the language that is used will vary by source.

Essentially the USA made a political choice to negotiate with and on occasion criminally prosecute Mafia-related leadership in national labor unions, instead of "allowing" the uncertainty of committed socialist labor leaders.