The "Free 6ix9ine" movement has its backers in the NY underground.
In a video that was later reposted by Tory Lanez, NYC subway performed their homage to Tekashi 6ix9ine while he awaits trial. You might recognize the performers in question as the trouble that films itself putting on WWE-themed wrestling matches in the NY subway system, with Tim Hann Rivera, their "spiritual leader" generally calling the shots.
The troupe has made a habit of mimicking famous wrestlers like Stone Cold Steve Austin and The Undertaker when they partake in their subway wrestling invitationals. The matches are often of the "Royal Rumble" variety, in which new participants are added at every subway stop. So how does Tim & company decide a winner? Based on what I've seen, the wrestlers can be eliminated via 1-2-3 count, and in some instances, albeit less often, they get tossed right out the train when doors open. Simple enough, right?
In their homage to Tekashi 6ix9ine, the troupe did away with the "Royal Rumble" stipulations to incorporate more hip-hop oriented dance elements. As you can see (below), the members of the troupe dressed as WWE legends (Bret Hart, Stone Cold, referees, etc) do a medley dance to Tekashi 6ix9ine's new hit song "WAKA," while members in the back hold up "Free 6ix9ine" signs. The video delves into chaos once the first RKO finisher is administered mid-dance. Check it out.