BTW, what is a flack?
Originally, (FL)ug(a)bwehr (K)anone -- German 88mm anti-aircraft cannon
Subsequently, any anti-air gun or cannon, particularly when fired at a
position rather than aimed at a particular target.
Presently: [[ oproer, samenscholing, Tumult, schiamazzo ]]
Criticism, ado, alarm, excitement, noise, grief, hullabaloo, angst,
wailing and gnashing of teeth, din, clamor, hubbub, rumpus, tumult,
uproar, disturbance, objection, consternation, meshugas, narrichkeit,