Career
Adda was a respected figure of the Tunisian left opposition. He described himself as an Antizionist Tunisian Jew. He brought unlimited support to the liberation of Palestine, often proclaiming his support to the rights of "the martyr population in Palestine".
He fought "for freedom, democracy and human rights, for defence of just causes in Tunisia and the world".
He was also active in the fight for workers" rights in the Tunisian General Labour Union. He belonged to the group which went on with the clandestine struggle after the arrest of the Neo-Destour and Communist leaders in September 1934.
He was himself imprisoned by the French colonial authorities from September 1935 to April 1936. Once out of jail, he was nominated on June 1, 1936 at the National Conference of the party as Vice Secretary-General, and in charge of the Communist Youth.
In April 1940, he was placed under house arrest at Zaghouan, then at Béja where he stayed until November 13, 1943, when he fled to neighbouring Algeria.
Adda was arrested again in 1952 by the French colonial authorities, and with other Destour and Communist leaders was sent to internal exile in Southern Tunisia. He was not freed until 1955. He later wrote about this period:
Foreign the liberation of my country, I knew prisons, concentration camps and deportations by the French colonialists.
After independence he continued to play a role as an activist, but without an official post inside the party.
His presence was still felt through his opinions, press articles and participation in democratic and trade-unionist movements.