. (1) Internally, arouse the masses of the people. That is, unite the working class, the peasantry,

the urban petty bourgeoisie and the national bourgeoisie, form a domestic united front under the
leadership of the working class, and advance from this to the establishment of a state which is a
people's democratic dictatorship under the leadership of the working class and based on the alliance
of workers and peasants.
(2) Externally, unite in a common struggle with those nations of the world which treat us as
equals and unite with the peoples of all countries. That is, ally ourselves with the Soviet Union, with
the People's Democracies and with the proletariat and the broad masses of the people in all other
countries, and form an international united front....

using this context what's the purpose of this source in 1 sentence

The purpose of this source is to advocate for the internal unity of different social classes under the leadership of the working class, as well as the external unity with other countries and peoples in order to establish a people's democratic dictatorship.