 Henrietta became an organiser for the Australian Workers' Union and later became influential in the Women Workers' Union, serving as its delegate to the Trades and Labour Council.In 1902 the family was in Sydney, where Greville became associated with Bertha McNamara's radical group, and in 1908 she became an organiser for the White Workers' Union.An anti-conscription campaigner, she and Eva Seery were the first women endorsed for a federal election by a major political party when they ran for the 1917 federal election as Labor candidates, albeit in safe conservative seats (Greville was defeated in Wentworth).