Someone

alias gb { 
  /amsg Global ban: $address($1,2) aka $1 $+ . Reason: $2- 
  /set %blacklisted [ $+ [ $address($1,2) ] ] 1 
  /set %blacklistreason [ $+ [ $address($1,2) ] $3- 
} 
on *:JOIN:#:{ 
if ($me isop $chan) || ($me ishop $chan) { 
  if (%blacklisted [ $+ [ $address($nick,2) ] ] == 1) { /ban -k $chan $nick You are blacklisted. Reason: %blacklistreason [ $+ [ $address($nick,2) ] } 
} 
alias ungb { 
  /amsg Global unban: $address($1,2) aka $1 $+ . Reason: $2- 
  /unset %blacklisted [ $+ [ $address($1,2) ] ] 
  /unset %blacklistreason [ $+ [ $address($1,2) ] 
}