Yes, we know the KGB were active in the US so it stands to reason they'd be carrying out acts of sabotage from the moment the US entered the war in Europe. This could have been as overt as blowing up bridges or as covert as simply moving a decimal point on a spreadsheet.
I'd expect most of the sabotage would petter out after November 1997 as the agents realise they're not going home any time soon and need to make the best of a crappy situation. Only the hard core agents would keep up operations I'd think.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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