This Gangbusters penciller is familiar enough, but the inker isn't anyone I've seen on the title.
And for good reason. "The Cop They Couldn't Lick" isn't from DC's Gangbusters
at all but from Quality's Police
Comics #102, October 1950.
(The last Plastic Man/Spirit issue; this first in a series of
miscellaneous police backups got a jump on the switchover in #103 to
Ken Shannon, T-Man, and other non-superhero police-type features.)
I actually couldn't tell you who's inking Curt Swan here (or in fact
many of the Quality inkers of the period apart from Chuck Cuidera). The
writer is Joe Millard.
single story (seen so far!) for Atlas, this is the only piece I've
found of his at Quality. By the way, compare
the date of that Atlas story ("Killer at
Large" in Crime Cases
#25): November 1950.