I decided to do some research on such online harassment campaigns. What I noticed that there are multiple online harassment campaigns that, similarly to Gamergate:

• start on some levels of misinformation, usually by twisting the words or actions of the target,
• the harassers control the narrative online by attacking anyone daring to oppose it in any way of form, by further harassment,
• the harassers not satisfied until the main target (and often the newer targets) are ran off the internet, or some other demands are met.

I know that 4chan had a few rounds with harassment campaigns of the past, and I also have some suspicion that some 4chan users really wanted to chase the Project Chanology fame, but failing miserably. I did notice that some people have a weirdly specific brand of “mental health activism”, that seems like it was made around the fact that the Church of Scientology was strongly anti-psychiatry, with some of those people even being leftists. I however do not remember too much of it, save for that they allegedly caused some teen girls commit suicide.