Who are those Project Veritas clowns?

I remember in one of their videos, they had a hidden camera on a supposed Pfizer researcher, with him saying they are actively trying to mutate the COVID virus. But no such person ever worked for Pfizer.

I wonder why these guys havent been sued yet?

They have been sued and they lost: https://www.nytimes.com/2022/09/22/us/politics/project-veritas-lawsuit.html

They settled another suit: https://www.nytimes.com/2023/05/09/nyregion/project-veritas-settlement-employees-workplace.html

James O'Keefe left the company months ago and they were suing him, but... Layoffs have now gutted the whole Project Veritas team, from what I've read recently
https://www.thedailybeast.com/layoffs-gut-project-veritas-as-staffers-ask-what-the-fck-happened-under-hannah-giles-leadership