Career
He was a Barrister by profession. Condon Byrne joined the rest of the DLP senators in losing their seats in the 1974 double dissolution election, where public outrage at the appointment of former DLP leader Vince Gair as Ambassador to Ireland by ALP Prime Minister Gough Whitlam led to a dramatic slump in their vote, wiping the party out. In the Senate he was considered to be a polished debater who only relied on a handful of brief notes to make a speech.
After his term as a Senator, Byrne returned to the law, returning to practice at the Bar in Queensland.