Tweets using the hashtag often included overtly racist messages from troll accounts:
That hashtag and the false and racist messages is the latest incarnation of a long-running hoax used by trolls to spread negative stereotypes about black people, and Black Lives Matter in particular.
"Lootcrew" started in 2012 during Hurricane Sandy, when a group of online trolls called the Gay Nigger Association of America (GNAA) used #SandyLootCrew for tweets like these:
Those and other tweets were treated as real in articles by the Daily Mail and InfoWars.
Lootcrew was quiet for a while but came back in force when riots broke out in Baltimore after the death of Freddie Gray. Soon the #BaltimoreLootCrew hashtag appeared and people began sharing images that had nothing to do with Baltimore.
This account sent racist messages using that hashtag.
Today the account mostly tweets about the AltRight and Donald Trump.
The lootcrew hoax sometimes intersects with another troll tactic with roots on 4chan/8chan. As previously reported by BuzzFeed News, whenever there is a mass shooting trolls go on Twitter and falsely point the finger at a comedian named Sam Hyde.
When the unrest started in Milwaukee, this account tweeted a photo of Hyde with the #MilwaukeeLootCrew hashtag. The Twitter user said he was about to steal Hyde's car. The tweet received hundred of retweets.
The account later joked about the tweet being treated as real by the Drudge Report and a local news organization.
So remember: anytime you see a hashtag with lootcrew in it, the photos and claims are almost certainly false.