Ecuador legalized gangs and murder rates plummeted

Maybe I didn’t read this carefully enough, but how exactly do you legalize a gang?

I thought at least in US, there is no “being in a gang” charge. A random news search shows people who were called “gang members” but arrested for charges like illegal gun possession [0]. So how do we decriminalize that?

[0] https://www.kxii.com/content/news/Irish-Mob-gang-member-arre...