Milliner was born at Kelvin Grove, Brisbane. He attended the local state school, served an apprenticeship as a compositor at the Queensland Government Printing Office and became a linotype-operator. On 26 March 1938 he married Thelma Elizabeth Voght, a schoolteacher. He joined the Queensland Printing Employees' Union and was elected in 1934 to the board of management. A delegate to the Trades and Labor Council of Queensland, he was a member of the executive and treasurer. As trade-union adviser on the Australian delegations, he travelled to Geneva to attend the thirty-seventh and forty-eighth sessions of the International Labour Conference. Milliner represented Small Unions and his own union on the Queensland central executive of the ALP. An active and influential State party manager, he chaired the rules committee, held office as vice-president for a term, and was president in 1963–68. At the meeting called in April 1957 to consider the situation of the then Labor Premier of Queensland, Vince Gair, he moved that there be further negotiations before the premier's expulsion from the ALP was discussed; when his proposal was rejected, he voted with the TLC group to expel Gair. Milliner was a competent chairman who tried to achieve unity, to broaden the party's electoral base, and to encourage the involvement of women and the young. His leadership proved decisive in winning party support in Queensland for Gough Whitlam in his confrontation with the ALP's federal executive in February 1966. In 1962 Milliner had unsuccessfully sought party nomination as one of two candidates to be considered by the Legislative Assembly of Queensland for a casual vacancy in the Senate. At the 1967 election he won a seat in the Senate. His term began on 1 July 1968. He sat on ten parliamentary committees and in 1974 was appointed temporary Chairman of Committees in the Senate.
Death and replacement
Bert Milliner died suddenly of a heart attack on 30 June 1975 in his Brisbane office. The question of his replacement then arose. Since 1946 it had been a previously unbroken convention that when a casual vacancy arose through the resignation or death of a senator mid-term, the relevant state parliament would replace the senator with a nominee chosen by the departed senator's political party. The ALP provided one name to Queensland Premier Joh Bjelke-Petersen—that of Mal Colston. Bjelke-Petersen asked for a list of three names, which the ALP refused to supply. He then chose as Milliner's replacement Albert Field, who was a member of the Labor Party but was openly critical of the Whitlam government. The Queensland Legislative Assembly duly appointed Field to the vacancy. The ALP immediately expelled Field from the party because he accepted an appointment contrary to its wishes. The ALP challenged his appointment in the High Court because he was still technically employed by the Queensland Public Service at the time of his acceptance of the appointment. He had resigned, but without giving the required two weeks' notice. Consequently, Field was on leave from the Senate for all but a few days of his term. The Opposition coalition chose not to provide a pair. Consequently, the numbers in the Senate were weighted against Labor. That was one of the factors that enabled the Senate to block the Whitlam government's Supply bills, which in turn led to the government's dismissal. Milliner's son Glen was a member of the Legislative Assembly of Queensland from 1977 to 1998.
