Conor McGregor is being hailed as a HERO by a foundation that helps the families of emergency responders who died as a result of the 9/11 attacks ... claiming CM's $1 million donation will have a REAL impact on families in need.
The UFC star, along with Proper 12 Whiskey company, officially wrote a $1 million check to the Tunnel To Towers Foundation ... which was founded by the brother of an FDNY hero, who was killed in the World Trade Center attack.
We spoke with Frank Siller, brother of Stephen Siller, who tells us McGregor's gesture is nothing short of incredible.