All 8 are speaking under anonymity, for fears of professional repercussions. They all describe Spacey as having predatory behavior towards young male assistants, which included crude comments and nonconsensual touching.
One of these employees, a production assistant, states that he needed to pick Spacey up and drive him to set. Minutes before they arrived, Spacey put his hand down the assistant's pants. Spacey began touching him again as they arrived in Spacey's trailer. When the assistant told him how uncomfortable he was, Spacey left the set and did not return.
Another crew member stated Spacey's behavior was out in the open for everyone to see, but no one said anything for fear of losing their job, as "who's going to believe crew members?"
Production for House of Cards' final season shut down earlier this week. It is unknown when (or even if) it will continue.
In other Spacey news, an awards season push for his supporting role in Ridley Scott's All the Money in the World has been canned.