An earlier foray into politics was in the general election of 1999, when he contested the Suva City Open constituency as a candidate of the Fiji Labour Party. He received 29.8 percent of the vote on the first count, some two percentage points behind the United General Party (UGP) candidate Ofa Duncan (now Ofa Swann); when votes for minor candidates had been redistributed under Fiji's transferable voting system, he was more than ten percentage points behind Duncan. His second attempt, in the 2001 election, was successful. In the meantime, a coup d'état had deposed the elected government in 2000 and some major political realignments had taken place. Now a member of the New Labour Unity Party (NLUP), he contested the Suva City General Electors Communal constituency, one of three reserved for ethnic minorities. Zinck won almost 33 percent of the vote on the first count, and went on to defeat Kenneth Mang-Kwong Low of the United Fiji Party (SDL) with more than 60 percent, after preferences had been distributed. He was one of only two NLUP candidates to be elected, the other being Duncan, who had defected from the UGP.
The election produced an inconclusive result; the United Fiji Party (SDL) of Laisenia Qarase emerged as the largest single party, with 32 of the 71 seats, short of an overall majority in the House of Representatives. Qarase cobbled together a coalition with a number of smaller parties and independents. Zinck defied the NLUP leadership by accepting a Cabinet post, and after repeated refusals to resign, he was expelled from the party on 4 December 2003. He is still officially listed as an NLUP parliamentarian, however, even though the party was deregistered in 2005.
On 20 February 2006, Zinck said he had decided to contest the the upcoming election, which was later held on 6-13 May, as an independent candidate. He had been invited to join the SDL, he told the Fiji Village news service, but had chosen to run as an independent at the request of his own constituents. Nevertheless, he declared that if elected as an independent, he would continue to support an SDL-led government, and expected to be included in any post-election Cabinet, according to Fiji Live (21 February). The election was won, however, by Bernadette Rounds Ganilau of the United Peoples Party (UPP), with Zinck finishing in third place. He blamed ethnic nationalism for his defeat, saying that Fiji's ethnic communities had all voted on communal lines, with the General Electors opting for the UPP.
Zinck, who is of Samoan, German, and Fijian descent, has called for increased representation for ethnic minorities in the House of Representatives. On 10 August 2005, he complained that the 8 seats allocated to minorities (Europeans, Chinese, Banaban Islanders, and others) under the 1970 Constitution had been whittled down to 5 in 1992 and 3 in 1997. If the trend continued, they might lose their parliamentary representation altogether, he said. He called for constitutional amendments to raise the number to at least 5.
Zinck's calls for greater minority representation in Parliament were immediately criticized by former Cabinet Minister Tomasi Vakatora, who said that the 3 seats allocated to them were already more than their population numbers warranted. When they had been allocated 8 seats in 1970, their contribution to the economy had been much more significant, he said.
Following his electoral defeat, Zinck became a trade unionist. He was arrested, and later released, by the Republic of Fiji Military Forces on the evening of 6 December 2006, after a relative of Military Commander Commodore Frank Bainimarama, who had seized power the previous day, allegedly heard him making derogatory comments about the Commander at Suva's United Club. (source) Zinck claimed to have been subjected to degrading treatment, including being forced to run around a sports field with the guns of four soldiers trained upon him. He was then allegedly forced to stand under a spotlight at Queen Elizabeth Barracks with soldiers standing behind him, warning him against making further statements against the Commander, before being ordered to leave the barracks. Fiji Human Rights Commission Director Shaista Shameem said on 9 December that the incident was being investigated. (source)