With his brother, Alfred, in 1932, he led five hundred unemployed workers invading the Shire Hall chamber.
Ten years later, NUDAW became part of the new Union of Shop, Distributive and Allied Workers (USDAW).
In 1967, there was a further presidential election, and Seabrook won the position back, on this occasion serving until defeated by Jim D. Hughes in 1973.
[5] Seabrook opposed the Soviet invasion of Hungary in 1956, and resigned from the CPGB,[1] later becoming associated with the Chartist group.
He was described by Patrick Palgrave-Moore as "one of the most controversial figures in recent times to hold office".