Iceman they were not active. First, only 2 players in l19 were involved, the other 4 multi conspirators were in other provinces (you can see them in KHoF just look for the piggies).
Of the 6 players involved, 4 of them stopped playing immediately after running their scheme. Even now they have 0 troops or training centers built, zero gaming activity. These are functional multies.
Of the 2 that continued playing the game, only 1 benefitted from the multis (receiving not just castles, but 500k gold and wood/iron/food). As such, the benefactor of the multis was marked excommunicado.
That leaves 1 player in l19 that continued playing the game after the scheme and did not benefit from the multis, so we left his kingdom untouched. Congrats @saadht, you survived the multi purge πͺ