Spinach is also slang for marijuana and green money.
I think he also means he gets money on the street from drug deals.
By Legion of Doom he means WWF wrestlers Hawk and Animal, also known as the Road Warriors.
More accurate lyrics are here:
GRABBED UP THE BOXERS
I think Everlast is saying the Bush family act like a Mafia or gangster in general, and more or less get away with murder.
It’s worth mentioning the Terminator 3 film was released about a year after this album.