The congress will not disclose how many of its leaders are Communist Party members.
"Communist Party members must clearly see through to the essence of this struggle and understand its gravity."
Other senior government and Communist Party members also attended the ceremony.
Some of those detained were Communist Party members, the documents say.
He was building his own 10,000-square-foot home, a shocking act for someone not even a Communist Party member.
He later said he was not a Communist Party member.
He became a Communist Party member at the age of 21.
"I'm a Communist Party member and have been for years."
Communist Party members were the only ones to vote against it.
Instead, only Communist Party members and their immediate families were required to participate in the campaign.
