PKK is seperate from and predates ISIL by many, many years. The first training camp was established in 1982 in Bekaa Valley (which was then under Syrian control), with the support of the Palestine Liberation Organization and Syria. Since the Kurds are spread over different states (Turkey, Iraq, Syria, Iran) so is the PKK. During the controversial Ergenekon trials in Turkey, allegations have been made that the PKK is linked to elements of the Turkish intelligence community.
The PKK engaged the Islamic State of Iraq and the Levant (ISIL) forces in Syria in mid-July 2014 as part of the Syrian Civil War. In August the PKK engaged IS in Northern Iraq and pressured the Government of Turkey to take a stand against IS. PKK forces helped "tens of thousands of Yazidis escape an encircled Mount Sinjar." In September 2014, during the Siege of Kobane, the PKK engaged with Islamic State forces in Syria, which resulted in conflicts with Turks on the border and an end to a cease-fire that had been in place over a year. PKK snipers were active fighting ISIL on the front line in Sinjar in 2015. Meanwhile, the Turkish government restricted PKK-associated fighters' movement across its borders and Turkish Air Force fighter-bombers attacked PKK positions in the vicinity of Daglica, Hakkari Province. In July 2015, Turkey finally became involved in the war against ISIL. While they were doing so, they decided to bomb PKK targets in Iraq.
Your comment suggest you are ill-informed
ps. Are you suggesting Turkish retaliation against Belgium? As if threats are going to help Turkey...
Yes, the PKK is listed as a terrorist organization by several states and organizations, including the North Atlantic Treaty Organization (NATO), the United States of America and European Union.
However, the United Nations and countries such as Switzerland, China, India, Russia and Egypt have not designated the PKK as a terrorist organization.
Source:
https://defence.pk/threads/belgium-allows-pkk-to-celebrate-the-anniversary-of-its-first-terror-attack-against-turkey.444467/#ixzz4HUyWy0Th
Belgium is a member of NATO and EU as well as UN.
As indicated, how police decide to deal with an unauthorized demonstration is their priveledge (an operational decision). It does not mean the Belgian authorities condone or support PPK (tactical and strategic decisions). Only simple minded people make such simple connections
. The PKK and Isil have one thing in common p:both are terror groups but PKK is tacitly supported because it serves your interests. They will be dealt with one way or another, no matter how many demonstrations they are allowed to stage in your countries and no matter how long the text wall you post here. 
