Wachuku returned to Nigeria in 1947, travelling in the same ship with Nnamdi Azikiwe; and was present at Takoradi, Gold Coast (present-day Ghana) when Azikiwe spoke to Joseph B. Danquah, leader of the United Gold Coast Convention – concerning the organizational ability of Kwame Nkrumah. Azikiwe then urged Joseph B. Danquah to invite Nkrumah back home from England. In the same year of his return to Nigeria, Wachuku joined the NCNC, and was elected the Party's Legal Adviser and Member of the National Executive Committee. He soon got involved in the nationalist agitation of that period and was a favoured lecturer at the Glover Memorial Hall, Lagos. There, in one of his lectures, Wachuku provoked national controversy when he declared Lagos a "no-man's land" – meaning that it was an all-Nigerian city – wherein all Nigerians were entitled to equal rights. Among other responsibilities, Wachuku was Principal Secretary of the Igbo State Union from 1948 to 1952. In 1949, he founded a radical youth movement, the New Africa Party, and affiliated it to the NCNC in 1950. NCNC was later called: National Council of Nigerian Citizens. Concerning Wachuku's New Africa Party, in a letter from London, dated 29 May 1951, sent to W. E. B. Du Bois, and later included in "The Correspondence of W. E. B. Du Bois", George Padmore said: