The U.K. took steps Monday in parliament to make membership in two right-wing terrorist groups illegal.

In a statement, the government said it will proscribe Sonnenkrieg Division (SKD) as well as System Resistance Network, an alias of the already banned right-wing group National Action.

“As part of the order to proscribe SKD, the entry for Partiya Karkeren Kurdistani (the Kurdistan Worker’s Party or PKK) will be amended to include Teyre Azadiye Kurdistan (TAK) and Hezen Parastina Gel (HPG) as aliases,” it said.

Home Secretary Priti Patel emphasized that recent attacks in Germany have highlighted the threat of violent extremism.

Read more: UK takes action to ban two right-wing terrorist groups