(Bloomberg) Merger-arbitrage investors say the tide is turning in their favor after the Biden administration’s antitrust push suffered a huge legal blow this week, boosting the funds’ returns and emboldening bets on deals in regulators’ crosshairs. Most Read from BloombergSingapore Arrests Minister, Property Tycoon in Graft ProbeHow Much Income You Need to Crack America's Richest 1%Biden Administration to Forgive $39 Billion in Student DebtTreasury Euphoria Dwindles After Hot Economic Data: M