1. Under the July 2020 national security law, secession refers to separating Hong Kong from the People's Republic of China.
2. Subversion refers to undermining Hong Kong's government or the central government of China.
3. Collusion refers to disclosing state secrets or threatening national security using foreign assistance.
4. Terrorist action, or terrorism, refers to serious violence against the people or infrastructure in Hong Kong or other parts of China for political purposes.