Milan Bandić was a Croatian politician and the longest-serving mayor of Zagreb, the capital of Croatia. Bandić was mayor almost continuously from 2000 to 2021, except during the time between his resignation in 2002 and the 2005 election. He was also suspended from exercising his powers and duties for several months after his 2014 arrest over a corruption scandal. Out of Bandić's multifaceted engagement in politics, the most noted part was his mayoralty of Zagreb, which followed the Croatian Democratic Union's (HDZ) first post-socialist period of government (1990–2000), and exacerbated many existing transitional problems in the city.

The Croatian Democratic Union is a major conservative, centre-right political party in Croatia. It is one of the two major contemporary political parties in Croatia, along with the centre-left Social Democratic Party (SDP). It is currently the largest party in the Sabor with 62 seats. The HDZ governed Croatia from 1990 before the country gained independence from Yugoslavia until 2000 and, in coalition with junior partners, from 2003 to 2011, and since 2016. The HDZ's leader, Andrej Plenković, is the current Prime Minister of Croatia, having taken office following the 2016 parliamentary election.