No, it isn't quite so obvious how the "BADA-BING!" phrase ties in with Sonny's witnessing Fanucci's murder.
But you're more than welcome to try & elaborate on your reasons for thinking so.
Apple
A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned - this is the sum of good government.
