Chaos Computer Club - Europe&#x27;s largest association of hackers (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chaos_Computer_Club" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chaos_Computer_Club</a>)