Dirty Cop is the lowest of low, in the Cop Society.
_________________________________________
Louis Eppolito and Stephen Caracappa are two former New York Police Department (NYPD) police detectives who worked on behalf of the New York Mafia, principally the Lucchese crime family, while they committed various illegal activities.
In 2006, they were convicted of labor racketeering, extortion, narcotics, illegal gambling, obstruction of justice, eight counts of murder and conspiracy to commit murder, charges stemming from the 1980s and the early 1990s in New York, and in the 2000s in Las Vegas.
Both were sentenced to life in federal prison.
https://en.wikipedia.org/wiki/Louis_Eppolito_and_Stephen_Caracappa
Thank you for the comment. I was wondering if there was specific meaning to the phrase.