Kata'ib Hezbollah. How strong?

How strong is Kata'ib Hezbollah? That is the Iraqi Shiite militia that was in the spotlight in late 2019 and early 2020, especially after the American drone strike that killed Qasem Suleimani and Abu Mahdi al-Muhandis. It has since 2014 been part of the Shia-dominated Popular Mobilization Forces. VIDEO IS STRICTLY NON-POLITICAL.

Sources:
CTC Sentinel, VOA News, Stanford Center for International
Security and Cooperation, trackingterrorism.org, Counter
Extremism Project, Wikipedia, unitedagainstnucleariran.com,
Global Fight Against Terrorism Funding, The Washington Post,
Haarets, Reuters ... and others.