Today Google announced that they have taken manual actions against a link network in Poland. You can see the Tweet confirming this below:
Today Google took action on a large link network in Poland.
— Karolina Kruszyńska (@karo_krus) November 24, 2014
There was a lot of speculation about which link network was targeted but now it seems that Prolink.pl was the network penalised. They actually confirmed it via a post on Facebook later. Check out the post:
Blog Post by: Greg McVey