I used FULLY COOKED frozen bacon inside fresh beef rouladen (thinly sliced beef rolled with onion, mustard and bacon).  I then browned the beef rolls, cooled them and then froze them for later use.  Was it safe to refreeze the bacon a second time and then warm this dish up again when it is time to eat it?  
Re-freezing is typically referred to in a different context. E.g., you took the something out of the freezer, let it thaw, and then put it back in the freezer in its original state.  Technically you are not 're-freezing' the bacon. You took the bacon out of the freezer and used it in your rouladen. Now you are freezing the rouladen.   It would be the same if you took a frozen meat of your choice and made spaghetti sauce and then froze containers of the sauce.  BONUS INFO ABOUT FULLY COOKED BACON - Fully cooked bacon is shelf stable until its expiration date as long as it remains unopened. Upon opening, it will need to be refrigerated. It can be frozen for longer term storage or storage past the expiration date opened or unopened.  The reason you find fully cooked bacon in a refrigerated case most, but not all, of the time, is because of consumer perception. Early on, it was realized that consumers (and even some retailers) weren't wrapping their heads around bacon not being refrigerated, even though it was fully cooked. So most stores put it in the dairy case next to uncooked or partially cooked bacon. 