The group was infamous for being brutal. It was a significant rival of Bartholomew's group, and the two factions often have several confrontations. Angels under Bartholomew's command looked down upon Malachi as a street thug, and would not allow their leader to meet with Malachi himself. However, this did not deter but instead only angered Malachi, who started to kill angels of the opposite faction.
With the death of Bartholomew and the splintering of his faction, Malachi's group of angels possibly currently holds the most powerful status among different angel factions on Earth. The faction is now presumed destroyed as Gadreel killed Malachi on Metatron's order. Other members could have joined either Castiel or Metatron.