Recently elected Queensland Labor senator Chris Ketter and Transport Workers Union (TWU) boss Tony Sheldon will give evidence at a union corruption hearing opening on Monday.
The Royal Commission into Trade Union Governance and Corruption will hold hearings in Sydney over a three-week period. First off the rank this week will be the the Shop, Distributive and Allied Employees Association (SDA) and the Transport Workers Union (TWU).
The commission has not specified what issues it will address.
Four witnesses are listed for the SDA, among them Senator Chris Ketter, former secretary-treasurer of the Queensland SDA.
Mr Ketter was elected to the Senate for Queensland last year and his term began in July this year.
A former SDA official Rosa Perry, who has alleged she was told that money she was compelled to pay into a slush fund for Mr Ketter's election campaign was tax deductible when it was not, will also be called.
Among the 14 witnesses listed for the TWU is national secretary Mr Sheldon who is also a non-voting vice-president of the Australian Labor Party.
On the witness list also is TWU's general counsel, Michael Burns, communications officer Tom Pacey and Victorian union official John Berger.
In the coming weeks the commission will revisit the Health Services Union (HSU) and Construction, Forestry, Mining and Energy Union (CFMEU)