The Enemy of My Enemy

S8, E3: Erin's trial against notorious human trafficker Chao Lin (Tia Carrera) is jeopardized when the presiding judge is found dead, causing Danny and Baez to investigate foul play. Also, Mayor Dutton (Lorraine Bracco) opposes Frank's public safety initiative, but City Council Speaker Regina Thomas (Whoopi Goldberg) devises a plan to help Frank bypass the Mayor's veto.