There was a piece in the NYT showing just how evil Giuliani is:

In 2014, Ukraine’s wildly corrupt president, Viktor Yanukovych, fled to Russia after mass protests on the Maidan, Kiev’s central square. During what Ukrainians call the Revolution of Dignity, police snipers killed dozens of demonstrators. In the revolution’s aftermath, a number of young idealists decided to plunge into politics, hoping to reform their troubled country from the inside. One of them was Serhiy Leshchenko, at the time perhaps the country’s most famous investigative journalist.[…]

Then Rudy Giuliani began attacking Leshchenko as a conspirator against America.

In 2016, Leshchenko had helped expose the “black ledger,” an accounting book of hundreds of pages found in Yanukovych’s former party headquarters. Among its many entries, it showed $12.7 million in secret payments to Paul Manafort. At the time, Manafort was running Donald Trump’s presidential campaign, but before that, he was one of Yanukovych’s most important advisers.

One of the reasons Manafort is in federal prison is that he failed to disclose or pay taxes on millions of dollars from Ukraine. But if you believe Giuliani, the black ledger was part of a plot to damage Trump.

During a Fox News appearance on May 10, Giuliani described the ledger as a “falsely created book” and Leshchenko as part of a group of “enemies of the president, in some cases enemies of the United States.” Last month, in an epic, ranting interview on CNN, he accused Ukraine’s leading anti-corruption organization, the Anti-Corruption Action Center, or AntAC, of developing “all of the dirty information that ended up being a false document that was created in order to incriminate Manafort.”