This paper was developed in the context of the discussion about the identification of boundaries in translation practice. Taking into account the postmodern theories of language, I try to understand whether it is possible to define, even in face of new conceptions of language, culture, subject and translation, reasonably stable characteristics of the translation practice. Some rewriting practices presented as traslations, but which, in my opinion, subvert excessively the original text pose a challenge for the definition of such boundaries. In this thesis, I analize three different translation projects which openly uphold a particular political agenda, in order to verify to which extent they are distanced from the definition of translation as the closest possible representation of a foreign text in a target language. The projects studied here are: feminist translations, postcolonial translations and Lawrence Venuti´s minoritizing project. This analysis aims at understanding the ethical and political motivations of the projects at issue and their main strategies. The pursuit of a specific conceptual and practical field for translation is linked to an ethical concern at which the reader is the focus of the discussion.