Five private companies, who employ around three quarters of Scotland's arms industry workforce, had thousands of closed door meetings with Westminster.
The UK Government is being urged to follow a shift in US foreign policy and stop selling arms, including smart bombs made in Scotland, to Saudi Arabia.
An arms company in Fife, funded by the taxpayer, has won dozens of contracts globally for border security walls, prompting claims it is profiting from “state repression and conflict".
The arms industry is preparing to use two spaceports planned for Scotland to launch military spy satellites, an investigation by The Ferret can reveal.
The UK government has failed to meet its official criteria for conducting “regular and thorough inspections” of arms facilities every three years at a controversial bomb factory in Scotland.
The UK government and arms firms based in Scotland were condemned in a Human Rights Watch report for selling weapons to an Egyptian regime that tortures children by waterboarding and electrocution.
Since the Yemen war began in 2015, war crime allegations have been linked to bombs made by US arms firm Raytheon, which has a factory in Fife.
Leonardo is targeting school leavers to work on Typhoon jets which have been used by the Saudis in Yemen's conflict.
Executives of a US arms firm which makes smart bombs in Fife could face investigation for potentially aiding and abetting alleged war crimes in Yemen by a military coalition led by Saudi Arabia.