[1] Siebel was also selected for higher education at the prestigious Karl Marx Academy just outside Berlin, and here he gained a degree in Social Sciences.
In 1952 Siebold took a job as a full-time official of East Germany's ruling Socialist Unity Party (SED/ Sozialistische Einheitspartei Deutschlands).
[1] He then became head of the Coal Industry section, both at the People's Economic Council (VWR / Volkswirtschaftsrat), and with the National Planning and Development Commission.
Since January 1978 East Germans had been working in the Bituminous coal mine at Moatize, following a firedamp explosion that had taken the lives of more than 100 Mozambican miners.
[2][7] Shortly before the snow storms, on 13/14 December 1978, at the 9th conference of the SED Central Committee, Siebold was on the receiving end of the conventional lavish praise, here from a candidate for Politburo membership called Werner Walde.
(„Plötzliche Abschaltungen dürfen gar nicht erst notwendig werden.“)[9] On 28 June 1979 Siebold was sacked by the Chairman of the Council of State, Willi Stoph.