Cash and drugs were seized by police in a series of pre-planned raids in a crackdown on crime in Rotherham.
Six raids were carried out across the town in an operation aimed at targeting offenders involved in organised crime.
Code-named Operation Leo, yesterday's day of action led to eight arrests for offences relating to the Proceeds of Crime Act.
Detective Chief Inspector Lee Berry, who was involved in the investigation, said: "Operation Leo has been specifically set up to address issues relating to illegal crime in Rotherham and plans have been put in place to take action against offenders who are engaging in it.
"As a force, South Yorkshire Police will continue to target organised crime and those benefiting from the proceeds of such crime which causes discontent within communities.
"I would like to thank all of the officers and teams who were involved in yesterday's activity and work will now continue under the operation, to remove further threats and illegal activity.
"We are committed to keeping all of our residents and communities safe and I encourage anybody who may have information, with regard to criminal activity in their community, to contact South Yorkshire Police."
The eight suspects arrested yesterday have since been bailed pending further enquiries.
Anyone with information should call South Yorkshire Police on 101 or Crimestoppers on 0800 555111.