According to Sammy Gravano , Gotti earned between $5 - 20 million per year during his tenure as Gambino boss .
Law enforcement authorities continued gathering evidence against Gotti that helped lead to his downfall .
According to Sammy Gravano , Gotti earned between $5 - 20 million per year during Gotti 's tenure as Gambino boss .
Law enforcement authorities continued gathering evidence against Gotti that helped lead to his downfall .