Lockwood says his father was a union man. As a factory owner, it's unlikely he would also be in a union.
Lockwood is released because the "Patriot Act" only applies to terrorist acts against humans, but his groups first attacks were in fact staged on humans in order to create anti-alien fear, which meant they should have fallen under the act.
The President says he pardoned Ben Lockwood. The President had previously concluded that Lockwood could not be charged and he was released without trial. No pardon necessary.