Fredericka Mandelbaum

Fredericka Mandelbaum, also known as "Marm", was a Canadian-born businesswoman who operated on the wrong side of the law. Between 1862 and 1884, she handled a substantial amount of stolen goods, estimated to be between $1 and $5 million, as a fence for various street gangs and criminals in New York's underworld. Her involvement in the city's criminal landscape was significant, earning her a reputation as a key figure in the organization and financing of numerous burglaries and other illicit operations.

Mandelbaum's influence extended to her role as a matriarchal figure in New York's criminal elements, rivaling that of John D. Grady and his gang. Her notable collaborations included working with George Leonidas Leslie on high-profile heists, such as the 1869 Ocean National Bank robbery and the 1878 Manhattan Savings Institution robbery. Through her activities, Mandelbaum left a mark on the post-American Civil War era as a prominent figure in the city's underworld, ultimately passing away in 1894.