I have suspected since 2001 that Russian spies have been infiltrating American companies and government for just such a purpose.
By using H1b visa and outsourcing, they can underbid most American contractors and get paid while they plot computer crashes and send back technical docs.
Bigger problem with the Chinese, IMHO. Even if they are not sabotaging, every single bit of Anerican intellectual property gets stolen and transferred back to the motherland.