Do all Condo Boards have managing agents?

I was told: Condo boards are surrogates that managing agents manipulate to control buildings. Managing agents charge a “management” fee and also benefit from an ability to impose costs on owners, such as unnecessary renovations or developer defects. In new and old condos, managing agents benefit because they have relationships with developers and contractors, whom they rely on for business. Control also allows managing agents to punish owners who stand in their way or keep out sophisticated buyers who question them about expenditures and may reveal waste or corruption. Buyers should be told about increased common charges and assessments resulting from managing agent actions, rubber stamped by condo boards. Can anyone offer an insight about this?