ICE is a terrorist organization trying to stop musicians from sounding off against immigration policies, and that's why 21 Savage is now behind bars ... so says U.S. Rep. Hank Johnson.
We got the congressman Monday at Reagan National Airport, and he didn't hold back, claiming ICE was up to no good when it nabbed 21 just days after he released a song critical of the agency.
As we reported ... 21 Savage and his people believe his arrest by ICE may have been motivated by revenge for his song, "A Lot," which includes the lyrics ... "Been through some things so I can't imagine my kids stuck at the border. Flint still need water. People was innocent, couldn't get lawyers."
Bottom line for Hank ... ICE needs to be reigned in.