Next to Tyson, Gerald McClellan by far. He was a sadistic SOB who only wanted to put you out painfully.
Fenech( worked with tyson late in his career),young Tyson, young Foreman, Frazier,Dempsey, la motta,Roberto Durán, Monzón was very aggressive despite his style, chavez
Hank Armstrong deserves a shout. Not so much for being dirty or violent but for his incredible go forward and workrate.
Marcos Villasana was almost the proto-type Mexican warrior of his generation... Endlessly aggressive, even against other very aggressive, hard punching fighters like Antonio Esparragoza he would still come forward, assert his pressure and become the aggressive fighter between the two. His style never changed as far as I know, he would go head to head with you regardless of who you were, whether a nuclear puncher like Jaime Garza or a capable puncher who was a more swarming type of fighter like Jeff Fenech, he would always employ the exact same game plan. Talk about having confidence in your chin...
Villasana was as hard as nails.Barkley was a very aggressive figher only knew one way to roll!.That pantra guy from Columbia who's name escapes me was also a nutter
Srisaket Sor Rungvisai of Thailand is one of the most aggressive active fighters, in my opinion. Punch stats had him throwing 95% power punches over the course of a 12 round fight. Kind of reminds me of Khaosai Galaxy honestly.