So you're pointing out one unrelated article from the UK gov actions of 1986 on a NGO as proof that EU is somehow anti-left politics? lol If you knew the UK gov, they don't like communism and communists especially during Thatcher, so any such NGOs would de under scrutiny, but that's a different issue than left wing politics.
How about looking at EU's polices and behavior as a whole and see where they are.
Why are European governments like Germany and France banning right wing candidates from elections, authorizing the use of spyware on them, or forming a "cordon sanitaire" around them even though most of their policies are the common sense left wing ones of the 1990s (no illegal immigration, strict legal immigration)?
EU today is by and large ideologically captured by super left wing and against anything remotely right.