Beastie Boys was a German-based c64 and Amiga cracking and sometime demo group, which also had several subgroups throughout its existence.
The group was voted #7 cracker group of the month in Illegal 19 (august 1987). Bride of Frankenstein (july 1987) and Saboteur II Trainer (september 1987) both listed Accept, Captain Future, The Syndicate, Profi, The Parade and Electro as active members during the period, indicating that the memberlist did not change during that period. The december release Bosconian Cheat added Mr. Fiend to the above list, while The Parade was seemingly gone.
The july 1988 release Bionic Commando ++ featured an unchanged memberlist from the Saboteur release, which meant Mr. Fiend (who was present in december) was no longer a member.