Writing on their website, London Palestine Action group claimed: "The real criminals are those who continue to support and arm the terrorist state of Israel."
Six women and three men have been charged with aggravated trespassing after chaining themselves to the roof of UAV Engines Limited in Lynn Lane, Shenstone., near Lichfield, earlier this week.
They will appear before Cannock Magistrates Court on August 20.
A statement on the campaign group's website said: "The factory was shut down for two days. Activists did this as part of the boycott, divestment and sanctions movement and in response to calls for action from Palestinian civil society.
"Their solidarity action was in turn supported by people of conscience from the local area and from all over the world."