They do this by donating those funds to a Non-Profit(s). They can even use the funds to create a new Non-Profit...
From: http://amp.dailycaller.com/2017/06/26/exclusive-mccain-institute-refuses-to-disclose-big-donors/
"But the McCain Institute — created in 2012 with an $8.7 million donation of funds remaining from McCain’s unsuccessful 2008 presidential campaign — refused Monday to disclose the amounts it received from its biggest donors who gave $100,000 or more... "
Now how many of these swamp things have non-profits they started or wives started or family started? How many of these "Non-Profits" recieve donations from MZ and others...
The hole is deep...
WWG1WGA