Krotze would apparently develop weapons for the DoD, and then sell the prints off to the Club, with spectacular profit. However, this scheme eventually backfired when Krotze's deal with Doctor Karl Swensen for his revolutionary M.A.X. technology went sour, and one of Krotze's flunkies killed the man. This was bad, as Krotze hadn't received the latest prototype for Swensen's newest M.A.X. suit yet.
While Krotze was looking for the suit (he knew Swensen had finished it), his daughter went and stole thing, suspecting (rightly so) that Krotze had her father killed. With the Club breathing down his neck, Krotze threw everything he had at Jenny Swensen, including lots of his experimental systems, but in the Mark 2 M.A.X. suit, the other technology failed again and again.
After Jenny seized proof of Krotze's dealings with the Club in her last encounter with the man, the Club had decided that Krotze was expendable. As such, they sent one of their best hit men, Steel Hawk, to eliminate the man, which he did in a way to implicate Swensen in the deed (killing two birds with one stone, was the idea). This didn't work, but isn't the point here.
Due to the disk Jenny seized, Krotze (and thus, Krotze International) came under investigation for treason, among other things. The ultimate result of these hearings is unknown (with Krotze's death, it'd be hard to force any convictions), but Krotze International was still in operation for a little while after Krotze's death. However, the status of the company to this date is unknown.