An outspoken and controversial politician, Ziemba spent six days in Toronto's Don Jail in 1977 for contempt of court when he refused to reveal his informant for allegations that the principals of Abko Laboratories were defrauding the Ontario Health Insurance Plan.
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In the 1990 provincial election, his sister-in-law, Elaine Ziemba, regained the High Park—Swansea seat for the NDP.