1951-1968

While in hiding, Moni Singh was elected secretary of Communist Party of East Bengal in 1951. In 1954, the Communist Party was banned by the government of Pakistan. In the third conference of the Party which took place secretly in 1956 Moni Singh was again elected secretary. He was interned in 1967. He was elected general secretary for the third time in the congress of the party held secretly in 1968