Private ownership and free markets.
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During the World War II the industry and the manufacturing of weapons by the war production plants was a major enterprise and the need for a trained security increased exponentially. The on site security was needed to prevent theft, sabotage and espionage. The security companies even started training their own security staff which was well trained and their training in time was close of that the police got. Some companies even had their own private investigators among their number.
Answer:
Starting around 494 BC, the plebeians began to fight against the rule of the patricians. This struggle is called the "Conflict of the Orders." Over the course of around 200 years the plebeians gained more rights. They protested by going on strike.
Explanation:
