I googled and all I found was a Chinese Tekken character named Marshall Law. Also sorry I have no info on who started the trend.
This was the first video I saw when I googled Marshall Law. Think we need people to investigate this because I’m the worst.
Anything on 3-16-20 for Q? Found a tweet tweeted then by Marco Rubio and he spelt is Marshall Law. Could be a mistake or done on purpose. Or at least used by Q since it trended back then as well.
https://twitter.com/marcorubio/status/1239553159154057216?s=21