He was a member fo the Bulgarian Communist Party from 1946.

Kostov was the leading figure of the Bulgarian Communist Party.

Soon the Bulgarian Communist Party became dominant in the organization.

The leading force in society and politics is the Bulgarian Communist Party.

Later, he became a member of the Bulgarian Communist Party.

In 1971, at 35, he was elected to the central committee of the Bulgarian Communist Party and appointed minister for foreign affairs.

He also became a member of Bulgarian Communist Party.

In 1990, the Bulgarian Communist Party set up an inquiry commission into the camps.

Matters became much worse when the Bulgarian Communist Party took power in 1944.

The result was a victory for the Bulgarian Communist Party, which won 278 of the 465 seats.