Marchand is a slew foot/clipping/low bridge hitting  machine.
https://www.youtube.com/watch?v=ThlP3tNVsWQ

Remember this hit on Sami Salo? Marchand lets the puck go and takes out Salo with a low bridge hit - note Salo has not played the puck.  The NHL suspended him 5 games noting it was a "predatory low hit delivered by Marchand to flip his opponent".
https://www.youtube.com/watch?v=1pWnBC9Bauc

On January 26, 2017 he was fined $10,000 for a slew foot on the Wings Kronwall.  How he was not suspended multiple games is a mystery.  
https://www.youtube.com/watch?v=8TKLM_O1rt8

Then the NHL looked the other way when he slew-footed the Lightning's  Anton Stralman. a couple of days later.  This is an accident????  With Marchand's history?  How does he even get the benefit of a doubt.
https://www.youtube.com/watch?v=NFm1NcibUeI