The German police have successfully deanonymized at least four Tor users. It appears they watch known Tor relays and known suspects, and use timing analysis to figure out who is using what relay.
Tor has written about this.
Hacker News thread.

  • far_university190@feddit.org
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    21 hours ago

    In contrast to the CCC, Chaos Computer Club, who was provided access to the documents related to the case and was able to analyze and validate the reporter’s assumptions, we were only provided a vague outline and asked broad clarifying questions that left us with uncertainty of the facts, and questions of our own.

    What the fuck

      • far_university190@feddit.org
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        20 hours ago

        large club of people interested in technology

        edit: https://www.ccc.de/en/

        The Chaos Computer Club e. V. (CCC) is Europe’s largest association of hackers. For more than thirty years we are providing information about technical and societal issues, such as surveillance, privacy, freedom of information, hacktivism, data security and many other interesting things around technology and hacking issues. As the most influential hacker collective in Europe we organize campaignsevents, lobbying and publications as well as anonymizing services and communication infrastructure. There are many hackerspaces in and around Germany which belong to or share a common bond to the CCC as stated in our hacker ethics.