W. Keith Campbell’s scientific contributions

... The numbers in FIRE's database might be dismissible as small given that they occur in a country with hundreds of thousands of professors. However, FIRE's database almost surely underestimates the number of faculty who have been targeted by academic left-wing mobs, because we know of events that did not rise to FIRE's attention or meet their selection criteria, some of which can be found in Stevens et al. (2018), and others which can be found in Shields and Dunn (2016). It is a near-certainty that far more incidents of shunning and ostracism, not to mention reputation-smearing whisper campaigns, interviews-never-received, promotions never granted, jobs never offered, and the like have occurred than will ever be recorded. ...

Reference:

The Radicalization of the American Academy