If you tell someone and their family that you are going to stop them from leaving their home, and there is a not unreasonable expectation of assault and or battery in that, you are going beyond the right of peaceable assembly and into the realm of false imprisonment, or kidnap.
"peaceably to assemble, and to petition the Government for redress of grievances". Is Levandowski in any meaningful sense the government, and if so what grievances is he in a position to redress?