I didn't get that out of the song. The lines about gathering up a group of guys and going after criminals makes me think of Westerns where the Sheriff deputizes a bunch of townfolk to help him go after bandits or whatever.
“Take all the rope in Texas
Find a tall oak tree, round up all of them bad boys
Hang them high in the street
For all the people to see”
That doesn’t sound like due process of law to me. Notice I didn’t say the song is strictly about vigilante justice, though, nor that it had anything to do with race.