Officers uncovered £50,000 in cash and one kilogram of white powder believed to be cocaine after they raided a property in Northampton.
A number of drugs warrants were executed throughout the Thames Valley, Northamptonshire, Essex and London areas, on Saturday as part of an investigation into an organised crime group.
More than 100 officers carried out 15 warrants under the Misuse of Drugs Act in Milton Keynes, Northampton, Harlow in Essex and Edmonton in North London.
The warrants were executed as part of Operation Rupert, which targets groups which are believed to purchase and supply cocaine, predominantly within the Milton Keynes and Northamptonshire areas.
At a warrant carried out in Northampton, 1kg of white powder and approximately £50,000 was recovered by officers.
Eight people were arrested on suspicion of conspiring to supply a cocaine including a 28-year-old and a 29-year-old man, and a 20-year-old woman, all from Northampton.
Senior investigating officer Det Insp Bruce Riddell from the Thames Valley Police Serious and Organised Crime Unit said: “We are in the early stages of this investigation but we have recovered substantial amounts of cash and controlled drugs.
“This is the result of a lot of hard work from a lot of officers and staff across a number of forces. I hope these warrants will send out a message to organised crime groups that with the support of communities we will find out who you are and we will do everything in our power to stop you.”
Four men have been charged with drugs offences including Jason Bailey, aged 28, of Lindsay Avenue, Abington, Northampton, who has been charged with acquiring criminal property and conspiracy to supply a Class A drug.
The other three men are Robert Burnett, aged 29, of Churchfield, Harlow, Essex, charged with conspiracy to supply a Class A drug.
Michael Mullen, aged 33, of Seaton Grove, Broughton, Milton Keynes, who has been charged with three counts of conspiracy to supply a Class A drug and one count of failing to provide a sample for drug testing.
Wayne Shirley, aged 42, of Laburnam Avenue, London, cwho is harged with two counts of conspiracy to supply a Class A drug.
The four men will all appear at Milton Keynes Magistrates’ Court on Monday morning.
Four other people arrested in connection with these offences were released on police bail until early October.