The arrests were made by officers from the Central Police Investigation Bureau (CBŚP) under the supervision of prosecutors in the southern city of Kraków.
Investigators said the group, whose members are Ukrainian citizens, is suspected of trafficking people and laundering proceeds from criminal activity.
In mid-April, CBŚP officers, working with the Polish police's Central Cybercrime Bureau (CBZP), conducted coordinated raids in Warsaw, Łódź and Wrocław, detaining the suspects, according to a statement.
Police also searched their residences and three locations linked to cryptocurrency exchange operations.
During the operation, officers seized electronic equipment, including mobile phones, laptops and tablets, as well as data storage devices and documents related to the exchanges.
Drugs and psychotropic substances, including marijuana, amphetamines, mephedrone, MDMA and LSD, were also found at one of the sites, police said.
The suspects were taken to prosecutors in Kraków, where they were charged with participating in an organized criminal group, pimping, money laundering and preparing to distribute narcotics.
A court ordered three of the suspects to be held in pre-trial detention at the request of prosecutors.
Authorities described the arrests as another blow to the group. So far, 30 suspects have been identified in the case, with indictments filed against some and 12 individuals already convicted.
The investigation is ongoing, and further detentions are possible, officials said.
(gs)
Source: IAR, PAP