Maybe I can answer first.
I, personally, had direct experience of being intimidated and harassed—actually in Canada. I have, from time to time, received threatening calls. At the same time, there have been attempts to hack into my email. Every time we come to important days like July 1 or October 1, there are emails containing files that are tempting me to open them, so that they can hack into my computer.
The most serious case was the time I was back in Hong Kong. After speaking at an international press conference calling upon the international community to support Hong Kong people in the fight against the extradition bill, I received emails pretending to be from people from mainland China who needed my urgent help. I fully understood that this was an attempt to track me down and possibly abduct me. During my time in Hong Kong, I had to ask all my friends to accompany me back to the hotel every time I finished my meetings.
This is my personal experience. Maybe at another time I can also share cases of other people, particularly the mainland Chinese activists here, regarding their experiences of being intimidated and harassed.