Radical Movement of Social Democratic Alliance (RIKSSY) (Greek: Ριζοσπαστική Κίνηση Σοσιαλδημοκρατικής Συμμαχίας, ΡΙΚΣΣΥ (a play on words with the homophone ρήξη, "rupture"), was a short-lived (2012-2013) political party in Greece, established in December 2012.
It was formed by Andreas Loverdos a former minister of the PASOK.