A man who works at an AI watchdog group was alarmed when OpenAI suddenly showed up at his doorstep last fall, demanding he turn over documents. To his utter disbelief, he was being subpoenaed.

“It’s a bit scary to know that the most valuable private company in the world has your address and has shown up and has questions for you,” the man, Tyler Johnston, who founded the nonprofit advocacy group The Midas Project, said in a new interview with A More Perfect Union.

“They were asking for every former employee we had spoken to and what we said to them,” he added. “Every congressional office that we spoke to, every potential investor that we spoke to.”

Johnston wasn’t alone. In all, NBC News reported last October that at least seven nonprofits that had been critical of OpenAI were served with subpoenas around the time of reporting, as part of a lawsuit between OpenAI and Elon Musk.