Case T-107/17: Judgment of the General Court of 23 May 2019 — Steinhoff and Others v ECB (Non-contractual liability — Economic and monetary policy — ECB — National central banks — Restructuring of the Greek public debt — Involvement of the private sector — Collective action clauses — Mandatory exchange of Greek bonds — Private creditors — Opinion of the ECB — Sufficiently serious breach of a rule of law conferring rights on individuals — Principle of pacta sunt servanda — Article 17(1) and (2) of the Charter of Fundamental Rights — Article 63(1) TFEU — Article 124 TFUE)