If the so-called "management fee" in the question refers to the contractor's illegal subcontracting or illegal subcontracting, it is illegal to collect commissions, affiliated fees and other fees from subcontractors or subcontractors. Article 4 of the Supreme People's Court's Interpretation on Applicable Legal Issues in the Trial of Construction Contract Disputes stipulates that the contractor's illegal subcontracting, illegal subcontracting of construction projects or unqualified actual builders' signing construction contracts with others in the name of qualified construction enterprises is invalid. The people's court may confiscate the illegal income of the parties concerned in accordance with the provisions of Article 134 of the General Principles of the Civil Law.