Gardai have asked anyone with knowledge of "intimidation and extortion" to report it as a man in his 60s was arrested in connection with an investigation in partnership with the Criminal Assets Bureau.
The man was arrested yesterday in west Dublin in relation to an investigation by gardai after CAB gave them evidence.
He was held at Clondalkin garda station yesterday and has since been released without charge.
The investigation is running alongside another that has examined a number of individuals who were nominated by CAB in 2016.
A garda spokesman said: "On Thursday 12th December 2019, Gardaí attached to DMR West arrested a male in his 60s in connection with a criminal investigation following the proffering of evidence by the Criminal Assets Bureau (CAB) to An Garda Síochána in December 2018.
"This is a parallel criminal investigation after a Criminal Assets Bureau profiler based in DMR West nominated a number of individuals for examination by CAB in 2016.
"The male was detained at Clondalkin Garda Station under Section 4 of the Criminal Justice Act 1984. He has since been released without charge. A file is being prepared for the Director of Public Prosecutions.
"An Garda Siochana appeals to any person who is subject to or has knowledge of any form of intimidation/extortion to report the matter, so that it can be fully investigated. These matters can be reported to your local Garda Station, or to the Garda Confidential Line at 1800 666 111.
"An Garda Siochana also appeal to anyone with information on persons who they suspect are living on the proceeds of crime to report this activity to the Criminal Assets Bureau 01-6663266, the Garda Confidential Line 1800 666 111 or CrimeStoppers 1800 25 00 25."
