Administrative contracts are characterised as an instrument used by the Public Administration to pursue its objectives. They are a kind of manifestation of the Democratic Rule of Law, since they enable the public manager to apply financial resources more efficiently. Because of this social function and also under the guise of the prerogatives and guiding principles of administrative contracts, the Public Administration has the power to manage, supervise and apply penalties within the scope of contracts. In this context, in the light of Law 8.666/93, the book highlights the importance of the Public Administration's sanctioning power, regarding the extent of the effects of the administrative sanctions of Temporary Suspension and Declaration of Unacceptability, applied to bidders and contractors in the event of total or partial non-performance of administrative contracts. To compile her approach, the author sought to present legal aspects, doctrinal and jurisprudential divergences, taken from a constitutional conception of protecting the fundamental rights and guarantees of bidders and contractors.