Anti-bikie police arrested four people and seized drugs on Wednesday following an affray in Dandenong in the week of 10 October.
Echo Task Force members, with assistance from Dandenong CIU detectives, executed warrants in Dandenong South, Endeavour Hills, Beaconsfield and Lyndhurst about 6am on 19 October.
They seized drugs and clothing at an address in England Street, Dandenong South, and arrested a 33-year-old man of no fixed abode.
He assisted police with their inquiries.
Police uncovered drugs in Manley Close, Endeavour Hills, and arrested a 20-year-old Endeavour Hills woman and a 54-year-old Endeavour Hills man at the scene.
In Fieldstone Boulevard, Beaconsfield, with help from officers from the Special Operations Group (SOG), police took a 24-year-old Beaconsfield man into custody.
No arrests were made at a property in Demmie Mews, Lyndhurst.
The investigation remains ongoing and no charges have been laid.
