Brazil’s STF power struggle turns into a legal knife fight over “Master” files and phone access—who’s winning?

Brazil’s Supreme Court (STF) is facing an acute internal governance crisis as President Edson Fachin and other justices clash over access to evidence and the handling of sensitive case materials. On September 11, Fachin ordered Minister André Mendonça to submit pending procedures within 24 hours in the “Master” case and also ordered the removal of secrecy over parts of the record. Separate reporting says Fachin is also requiring Mendonça to respond to a request by Cristiano Zanin for full access to the cell phone of Vorcaro, seized by the Federal Police (PF). Meanwhile, PF Director-General Andrei Rodrigues publicly argued that intelligence reports used by Alexandre de Moraes were “licit” and that there was no monitoring of ministers, adding fuel to the legitimacy debate around the court’s security posture. Strategically, the dispute is less about a single ruling and more about institutional control: who sets the rules for evidence, secrecy, and oversight inside Brazil’s top judicial bodies. The articles portray a “war inside the STF” with factions attempting to contain the fallout, including an “alignment” narrative between Fachin and Mendonça that is being assessed by a Moraes-linked wing. This matters geopolitically because Brazil’s rule-of-law credibility, political stability, and investor confidence are tightly linked to perceptions of judicial independence and due process. The immediate beneficiaries are the actors seeking procedural leverage—those pushing for transparency and access—while the potential losers are the factions associated with Moraes’s security-heavy approach if claims of selectivity or improper intelligence use gain traction. Market and economic implications are indirect but real: prolonged institutional conflict can raise risk premia for Brazilian assets by increasing uncertainty around enforcement, elections-related legal timelines, and the broader regulatory environment. The reporting also includes a parallel track involving investigations into Flávio Bolsonaro over payments from a disgraced banker, and a separate PGR request for information on Flávio Bolsonaro’s activity in Congress, which can amplify political volatility and affect sentiment toward domestic equities and credit. In practical terms, the most likely market transmission is through higher volatility in BRL-denominated risk assets, wider spreads in local credit, and sensitivity in rates and derivatives to “headline risk” from court decisions. While no direct commodity shock is described, the legal uncertainty can still influence FX hedging demand and the cost of capital for sectors exposed to political risk. What to watch next is whether Fachin’s deadlines and secrecy-removal orders are complied with cleanly by Mendonça, and whether Zanin’s request for full Vorcaro phone access triggers further procedural battles or appeals. The trigger points are explicit: the 24-hour window for pending “Master” procedures, the scope of secrecy withdrawal, and any further rulings that either validate or constrain the evidentiary basis tied to PF intelligence and communications. Another key indicator is how the PGR frames the “Master” file opening—whether it argues that the disclosure excluded key procedures and demands an end to secrecy, or whether it narrows its position. Finally, monitor whether Moraes’s stance on related votes (including dismissing a “confession” narrative and maintaining a coercion-related conviction) hardens the institutional divide or leads to a procedural détente inside the STF.

Geopolitical Implications

• 01

  Institutional credibility: the STF’s internal handling of secrecy and evidence access will shape perceptions of judicial independence and rule-of-law stability in Brazil.

• 02

  Security vs due process: the dispute over PF intelligence use versus transparency norms may influence how future high-salience cases are managed.

• 03

  Political risk transmission: legal timelines tied to prominent political figures can amplify election-adjacent volatility and affect investor confidence.

• 04

  Potential for procedural fragmentation: factional alignment narratives inside the STF could lead to more frequent procedural reversals and appeals, prolonging uncertainty.

Key Signals

• —Whether Mendonça meets the 24-hour deadline and the completeness of the submitted Master-case procedures.
• —The scope and pace of secrecy removal and whether PGR’s request to end secrecy is accepted or narrowed.
• —Any STF rulings that define admissibility or limits on PF intelligence-derived evidence.
• —Market reaction to court headlines: BRL volatility, local credit spreads, and implied volatility in BRL-linked derivatives.