Please answer the following question: Bogusaw Zbigniew Zietek (born October 9 1964 in Zawiercie) - Polish trade union activist. Co-founder and leader of Free Trade Union August 80 (Wolny Zwiazek Zawodowy Sierpien 80). From October 30 2005 to May 1 2013 he was leader of Polish Labour Party. From May 1 2013 he is acting leader of Polish Labour Party. He is also candidate of this party in the 2010 Polish presidential election. He has a medium technical education. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Office Holder