In an operation called "Regina", criminal investigators in Poland have arrested 102 men.
The operation took two years and was supervised by the Human Trafficking Department at Police HQ in Warsaw.
The paedophile ring first came to light in 2008 when police received a report of an image of a naked girl was circulating on a social networking site.
Police investigated the report and were able to track down who had shared the picture.
The 102 men arrested are accused of possession and distribution of pornographic photos and videos of children in the internet.
Four of the men have already been charged and police believe that as investigations continue they will make more arrests.
Raids that took place as part of the investigation led police to confiscate 133 computers, hard drives and laptops. They also confiscated 3,500 DVD's and CD's which contained images and video of child pornography.