Final answer:
The men described, dressed in white and advertising well-paying jobs, were likely headhunters, but based on the provided options, 'Salesmen' does not correctly depict their historical role in the labor market.
Step-by-step explanation:
The men described in the question were likely involved in the hiring process for a specific role or industry rather than personally seeking employment, suggesting that they were Headhunters (option c). Headhunters are professionals who specialize in recruiting highly qualified candidates for various positions. In the context provided, these men might be associated with industries that played significant roles in the economy of their region during historical periods of great labor movements, such as the Pullman sleeping and dining cars mentioned in the historical reference. However, based on the provided options and descriptions, the term 'Salesmen' (option b) does not accurately depict the historical individuals who are mentioned in the scenario nor their roles in the labor market.