What project provided the "smoking gun" that then President Boris Yeltsin was taking
bribes?

a Kremlin renovations project

Explanation:

According to some findings by investigators, it was discovered that huge sums of money went to payments of bribes and to President Boris Yeltsin's family.

Hence, It was this supposed Kremlin (referring to Russia's) renovation project that provided the "smoking gun" that the then President Boris Yeltsin was taking  bribes.

wealthy plebeians became part of the roman nobility. however, despite changes in the laws, the patricians always held a majority of the wealth and power in ancient rome. a third social class in roman society was the slaves. around one third of the people living in rome were slaves.

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i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.