Hong Kong Protester Sentenced To 9 Years In Prison

Tangin Kit received a nine-year prison sentence after crashing his motorcycle into police while carrying a protest banner. Democracy advocates express concern that the law under which he was sentenced threatens civil rights and free speech in Hong Kong. Although Hong Kong has its own judicial system and Legislative Council, China imposed this law to suppress dissent.

How does the law imposed by China affect Hong Kong's judicial system?

What is the main purpose of the law imposed on Hong Kong according to the text?