Since her ascendance to minor notoriety, Harper has become known for her abusive tactics and for misrepresentations of her critics.
[...]
Roberto Rosario is a 29-year veteran of software development and former head of Puerto Rico’s chapter of the International Games Development Association (IGDA). His crime, in Randi Harper’s eyes, was following the wrong people on Twitter.

Harper’s claim to fame is a Perl script called the “GGautoblocker”, which she says is a tool to automatically block “internet harassers” and “misogynists” on Twitter. But peer-reviewed research (*) commissioned by the feminist organisation Women, Action and Media found that just 0.66 per cent (65) of the 9,844 Twitter accounts on the list can be classified as “harassers.”

[...] If you follow the wrong people, you are automatically added to the list, regardless of what you, personally, have done.

This is what happened to Roberto Rosario, one the most prominent figures in Puerto Rico’s tech community. Describing Harper’s list as “the most idiotic algorithm I’ve seen,” Rosario pointed out that preemptively accusing people of harassment and misogyny on the basis of their associations was “nonsense.”
[...]
Harper made no effort to clear Rosario’s name, stating instead that if Roberto “didn’t want to be labelled a creep, he shouldn’t attack women’s credibility,” and refused to remove his name from the list.

What followed was a relentless campaign of abuse against the software developer. Since criticising Harper, Rosario says he has been “harassed and threatened on the web daily” because of people who “didn’t know him and assumed he was a misogynist,” thanks to his inclusion on Harper’s list.

Needless to say, far from being a misogynist, Rosario is a sponsor of IncludeGirls, a group that aims to improve gender representation in tech. Such details didn’t matter to Harper or his other abusers.
[...]
Rosario’s career was also targeted, and he states he was even blacklisted from speaking at certain events. He was eventually cowed into silence, and no longer issues public comment on Harper’s blocklist or related issues.

Throughout these happenings, Harper, the “online abuse prevention activist,” did nothing to assist Rosario. His name remains on her blocklist.

Chris von Csefalvay

Chris von Csefalvay is a data scientist living in Oxford. He is a fellow of both the Royal Society of Arts and the Royal Statistical Society, with degrees from the Universities of Oxford and Cardiff. He is currently chief data scientist to a FTSE 100 company.
[...]
Csefalvay first became a target of Harper after he published a network analysis indicating that GamerGate, a movement Harper is implacably opposed to, did not fit the characteristics of an “online hate campaign.”

During a Twitter exchange with Csefalvay, Harper accused the data scientist of employing a “dismissive tone.” Csefalvay clarified his position, stating that dismisiveness was not his intention and that “the more people interested in [the topic of gamergate], the better.”

Harper did not accept his apology. Accusing Csefalvay of being a “fake data scientist,” she urged her followers to explain to him why he “isn’t just a sexist tool, but an entire sexist home depot.” Naturally, she also added him to her autoblocker.
[...]
Csefalvay says Harper is an “obsessive” and that she continues to keep tabs on his tweets despite the fact that he wants nothing more to do with her.

“She likes hitting the vulnerable points of people,” says Csefalvay. “Her most recent attacks on me were on the day I was diagnosed with multiple sclerosis.”

Harper would continue to call out Csefalvay for several months, as a campaign of abuse against the data scientist escalated. “Once [Harper] got involved, things got particularly vile”, said Csefalvay, speaking to gaming blogger Stephanie Greene. “That’s when it got into the realm of of very graphic and very shockingly violent threats.”

In January, Csefalvay announced he was retiring from the online debate, after anonymous death and rape threats were made against his wife.

Claire Schumann

[...]
Like Harper, Schumann was an opponent of the GamerGate movement, and spent “months” in polite conversation with Brianna Wu, another opponent of the movement. Wu described her as “very polite.”

But Schumann began having second thoughts, opting to conduct an “Ask me Anything” session on GamerGate and anti-GamerGate communities on Reddit, in order to find common ground.

This attracted the attention of Harper, who accused Schumann of being a “gamergate sockpuppet” playing “psychological games.” Although she didn’t have to, Schumann apologised, and said she would stop commenting on the controversy.

This wasn’t enough for Harper. “You’ve made your Gamergate bed, now get ****ed in it,” Harper wrote. Schumann ended up being driven to tears by the blue-haired anti-abuse activist.

Vivek Wadhwa

[...]
For a long time, Wadhwa was also one of the leading advocates for diversity in technology. But he recently made the decision to end his advocacy on the issue, labelling the debate “toxic.” He made his decision after he was targeted by an online harassment campaign — one which Randi Harper was intimately involved with.

Wadhwa’s tireless advocacy for women and minorities in tech wasn’t enough for some feminists. In February, the blogger Amelia Greenhall kicked off a campaign against him with a blog post accusing him of hogging the limelight and employing a condescending tone. (No, really.)
[...]
The blog post cited Randi Harper, who just a few days earlier had accused Wadhwa of being a “profiteering pseudo-ally,” before going on a long rant explaining her theory of how Wadhwa’s commitment to diversity was insincere.

Naturally, the anti-abuse activist also descended to the level of personal abuse. “**** everything about this guy,” she added. When someone tried to stick up for Wadhwa, her response was, “Go set yourself on fire.”

It didn’t end there. Wadhwa’s Wikipedia and Amazon pages were targeted by a mob of his opponents, eager to ruin his reputation. Both websites are consulted regularly by members of the public and the press and, rightly or wrongly, what’s written there is taken seriously
[...]
Harper would eventually receive a comeuppance of sorts, after a group that monitors Amazon review trolling outed her(**) as a bully(***). They later received support from world-famous author Anne Rice