In 1942 Moody was elected unopposed to the National Executive Committee of the Labour Party in the Trade Union section, his candidature sponsored by the Amalgamated Society of Woodworkers.
He was chosen again as candidate for Liverpool Fairfield, and in the 1945 general election secured a swing of 14% to win the seat by 1,147 votes.
He was generally a loyal supporter of the government, but in 1948 he did break the whip to oppose an annuity to be paid to Princess Elizabeth and the Duke of Edinburgh after their marriage.
However, Moody urged disciplinary action be taken against Labour MPs who had signed a telegram to support Pietro Nenni, the Communist-allied Italian socialist.
At the 1950 general election, Moody's constituency was merged with others and he was selected instead for Gateshead East where he opposed Konni Zilliacus, who had been expelled after signing the Nenni telegram.