A holder of this position was the highest-ranking official to resign after an investigation by judge Samuel Seabury, great-great-grandson of the bishop. A non-actor Hugh Grant was the youngest ever holder of this elected position, despite living in Oradell. After being offered a bribe to not run for this office, Henry George ran for this office in 1886. (15[1])An anti-machine (15[1])candidate (15[1])for this office was elected on the City Fusion (-5[1])line and ran an anti-crime campaign that involved banning artichokes and dumping (15[2])(*) slot machines (10[2])into the river. (10[1])That holder of this office established the Triborough Bridge Authority, which was led by Robert (10[1])Moses. For 10 points, the power of Tammany Hall significantly declined after Fiorello LaGuardia was elected to what office? ■END■ (10[1])