The WikiLeaks website leaked several secret documents related to the proposed controversial Trade in Services Agreement (TiSA) on Wednesday.

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MOSCOW (Sputnik)Trade in Services Agreement (TiSA) is a proposed international trade treaty between 24 parties, including the 28 member states of the European Union and the United States. The next round of talks on the treaty will take place on June 6. Wikileaks uploaded 17 documents from the ongoing negotiations between the parties involved in TiSA.

Wednesday’s release "contains drafts and annexes on issues such as air traffic, maritime, professional services, e-commerce, delivery services, transparency, domestic regulation, as well as several document on the positions of negotiating parties," WikiLeaks said.

One of the annexes makes sure that the governments involved in the treaty do not favor local businesses over services of multinationals, according to WikiLeaks.

According to the portal, the TiSA core text will show the ideological and legal underpinnings of the treaty.

WikiLeaks previously released documents about the treaty in June 2014.

Critics of the deal say it will open the way to coordinated, supranational regulation labor laws, medical systems, finance and industrial policy, that will undermine governments' authority to protect its citizens.

WikiLeaks is an international non-profit journalistic organization founded in Iceland in 2006 to disseminate documents, photos and video of political or social significance.