Learn English – Any slang word for “debt-collector”?( specially among gangsters & criminals!)

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According to dictionaries, A collection agency, also known as a debt collector, is a business that pursues payments of debts owed by individuals or businesses.

But I have seen in movies that criminal organizations ( Mafias) hire some obnoxious men as ( illegal) debt-collectors whose job is to collect the payments by force and violently, if necessary!

I'd like to know if there is any slang word, term , phrase or idiom among those Mafias members for calling these "debt-collectors" or not!

PS:

1-I have found a British English word "bumbailiff" but it refers to officers whose job was collecting debts,in the past; so I'm sure I cannot use it for those men hired by Mafias as debt-collectors!

2-In the duplicate question, Morteza is looking for the "debt-collector", but I am looking for its slang equivalent! So please open my question!

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Best Answer

juice man (noun phrase, slang):

a hoodlum who collects money owed to a racketeer

'a 'juice man' (loan collector) for syndicate hoodlum bosses (1950s+ underworld)'

Source: Dictionary.com

juice collector (slang):

one who collects the money (juice) owed to a bookmaker or a loan shark

Source: Wiki

Books containing references to the above terms:

The Black Book and the Mob. Farrell, R. & Case, C.

The Rise of the Mafia. Short, M.

The Mafia Encyclopaedia, Sifakis, C. 2005