Opposing the executive branch through the legislative branch is subversion.
https://news.rthk.hk/rthk/en/compone...5-20200714.htm
"Every political party may conduct primary elections, but conducting primary election in this format, in this scale and the way that they are conducting it, giving the picture that they are doing something under authorisation of government, people may even think the government is doing it, this is not allowed," said Priscilla Leung. Which is surprising as the government was saying it looked illegal before the event.