Usage patterns
共産党に入るto join the Communist Party
He joined the Communist Party when he was a student.
共産党を結成するto form a communist party
After the war, a Communist Party was also formed in Japan.
共産党員a member of the Communist Party
Her father was a member of the Communist Party.
共産党が政権を握るfor the Communist Party to hold power
In this country, the Communist Party has held power for many years.