By September 1930, such movement had reached its peak in Nghe Tinh, resulting in the form of Soviet-type administration which exercised dictatorship over the imperialists and their stooges and pursued progressive political, economic, cultural and social policies.

While the mass's revolutionary movement was seething, the first plenum of the Party's Central Committee was convened in Hong Kong of China (from October 14-31, 1930), where it decided change name of the Communist Party of Vietnam into the Indochinese Communist Party, adopted the Political Platform and important documents on urgent tasks as well as mobilization of specific subjects among the mass. The Political Platform shed more light on a number of issues of law nature of the Vietnamese revolution. The plenum elected the official Central Committee of the Party with comrade Tran Phu as General Secretary.

The realities of the revolutionary high tide required a form of organizing and rallying the overwhelming majority of the mass against the imperialists. Therefore, on November 18, 1930, the Standing Board of the Party's Central Committee issued a directive on the establishment of the Indochinese Anti-imperialists League.

Though cruelly suppressed by the French colonialists, the 1930-1931 revolutionary high-tide proved that the party had adopted its correct lines on the Vietnamese revolution and brought about many precious lessons on the worker-peasant alliance and the building of an united front as well as on organisation of the mass in the struggle, on the struggle to gain and defend the power, on overcoming "leftist" deviationism. "Had there been no earth-shaking class battle during the 1930-1931 period, in which workers and peasants demonstrated their extraordinary revolutionary will, there would have been no high tide in the 1936-1939 period".

In face of cruel suppression by the French colonialists, in 1932, the foreign-based leadership of the Party's Central Committee was set up, adopting the Plan of Action in order to restore the organisation and lead the struggle. Between 1932-1935, the Party waged a struggle to preserve and restore forces, which, by the first congress of the Indochinese Communist Party's delegates (held from March 27-31, 1935 in Guankung, Macao of China) had been basically crowned with success, preparing all necessary conditions for the Party to enter into a new revolutionary stage. The first congress elected a 13 member- Central Committee with comrade Le Hong Phong as General Secretary.

In the mid-'30s, in face of fascist danger and under the direction of the 7th congress of Communist International (July 1935), the Party Central Committee held its plenum in Shanghai (China) in July 1936, where it decided to switch the strategic direction of the revolution, set the immediate objective, that was to oppose war, fascists and colonial reactionaries, to demand freedom, food and clothing, peace in many appropriate forms of organisation and struggle. At this plenum, comrade Ha Huy Tap was elected General Secretary of the Party, personally directing the revolutionary movement in the country. The Party's undertakings satisfied the then urgent demand of the people, giving rise to widespread mass movements such as the movement for convening the Indochinese Congress, the press struggle movement, the parliamentary struggle movement, the national-language disseminating movement. In 1938, for the first time in Indochina, May Day was celebrated openly in Hanoi, Sai Gon and other cities as well as in provincial towns throughout the country. Notably, the event in Hanoi was attended by 25,000 people.

In the course of leading the struggle, there appeared biased opinions. Therefore, on March 29-30, 1938, the Party Central Committee met to draw experience and at this plenum comrade Nguyen Van Cu was elected General Secretary of the Party. The deviations in organisational consolidation and struggle leadership, especially the settlement of the relations between the struggle for immediate objectives and the struggle for long- term objectives, in forms of organising the struggle, in unprincipled cooperation with the Trotskyites were later presented by General Secretary Nguyen Van Cu in a book entitled" Self-criticism" (July 1939).

The 1936-1939 democratic struggle movement won over millions of people to the ideal and built up a mass political force, thus preparing conditions for the mass to be engaged in new fierce battles in the 1940-1945 period.

In September 1939, World War II broke out, the French colonialists conducted barbarous suppression, abolishing the basic democratic freedom gained by our people during the period of democratic front. In 1940, Japanese fascists moved into Indochina, subjecting our people to "a dual yoke". The 6th (November 1939) and 7th (November 1940) plenums of the Party's Central Committee decided to give prominence to the task of national liberation while temporary shelving the motto of land revolution. Particularly, the 8th plenum of the Party's Central Committee (in 1941), chaired by leader Ho Chi Minh, finalised the lines for strategic direction, gave more prominence to the national issues and decided on the establishment of the Vietnam League for Independence Front (Viet Minh) in order to unite all Vietnamese patriots and actively prepare conditions for the general armed uprising to gain power. At this plenum, comrade Truong Chinh was elected General Secretary of the Party.

On the basis of such strategic shift, our Party step by step set to prepare necessary conditions for the general armed uprising to gain power. As far as the political forces were concerned, the Party strongly developed the "national salvation" organisations in all areas, thus creating a firm foundation for rising up and winning decisive victory when the opportunity came. In February 1943, the Standing Board of the Party Central Committee met, deciding to strengthen political forces in cities, particularly among workers. Also in 1943 the Party made public Vietnam Culture Programme, bringing out tasks on the cultural front, rallying writers and intellectuals into the Cultural Association for National Salvation pursuing the same objective of national liberation under the Party’s banner. As far as the armed forces were concerned, the Party maintained the Bac Son guerilla team, developing it into the National Salvation Army operating in the region of Bac Son-Vo Nhai revolutionary base. From various self-defense teams in Cao Bang, on December 22, 1944, leader Ho Chi Minh issued a directive to set up the Vietnam Propaganda Liberation Army.

On March 9, 1945, the Japanese staged a coup d’etat against the French, the Party launched a nationwide and anti-Japanese movement for national salvation. Partial uprisings broke out in many localities; the construction of war theatres and bases was stepped up. In April 1945, the North Vietnam military conference was convened by the Standing Board of the Party Central Committee in Hiep Hoa (Bac Giang province) “placing the military task above all other urgent tasks”, thereby, the Vietnam Propaganda Liberation Army and the National Salvation Army were unified into the Vietnam Liberation Army. The anti-Japanese movement for national salvation developed vigorously nationwide, shaking to the roots the Japanese militarists’ and their lackeys’ domination.

Seizing the revolutionary opportunity, the Party’s national conference held in Tan Trao (on August 13-15, 1945) called upon the entire population to stand up in a general uprising to gain power throughout the country. On August 16, 1945, also in Tan Trao, a national congress was convened, supporting the Party’s decision on the general uprising and electing the National Liberation Committee with Comrade Ho Chi Minh as President. Under the leadership of the Party, 25 million people, in the spirit of “bringing our efforts to liberate ourselves”, rose to a man to have gained the power within 15 days (from August 13 to 28, 1945), thus putting an end to the domination for nearly one hundred years by the colonialists and for thousands of years by the feudalists, establishing the democratic republic. The August 1945 Revolution was the victory of the Party’s correct revolutionary lines and talented leadership in armed uprisings, further developing and enriching the theories on national liberation revolution. With the victory of the August Revolution, “not only the Vietnamese working class and people but also the working class and oppressed people in other places could be proud that this is the first time in history of the revolution of colonial and semi-colonial nations, a Party, just only 15 years old, has lead the revolution to victory and gained power nationwide”.