, 3 0 0 ▁H SI ▁employees . ▁ ▁H SI ▁special ▁agents ▁investigate ▁viol ations ▁of ▁more ▁than ▁ 4 0 0 ▁U . S . ▁laws ▁that ▁threaten ▁the ▁national ▁security ▁of ▁the ▁United ▁States ▁such ▁as ▁counter - pro l ifer ation ; ▁counter - ter ror ism ; ▁human ▁sm ugg ling ▁and ▁tra ff ick ing ; ▁weapons ▁sm ugg ling ▁and ▁export ▁enfor cement ; ▁n arc ot ics ▁sm ugg ling ▁and ▁tra ff ick ing ; ▁document ▁and ▁benefit ▁fra ud ; ▁the ▁manufact uring , ▁sale , ▁and ▁use ▁of ▁counter fe it ▁imm igration ▁and ▁identity ▁documents ; ▁human ▁rights ▁viol ations ; ▁trans n ational ▁gang ▁activity ; ▁financial ▁cr imes , ▁including ▁money ▁la und ering ▁and ▁bulk ▁c ash ▁sm ugg ling ; ▁cy ber ▁crime ; ▁explo itation ▁of ▁children ▁and ▁sex ▁tour ism ; ▁trade ▁cr imes ▁such ▁as ▁commercial ▁fra ud ▁and ▁intellectual ▁property ▁the ft ; ▁sm ugg ling ▁of ▁counter fe it ▁ph arma ce ut ical s ▁and ▁other ▁mer ch and ise ; ▁mass - mark eting ▁fra ud ; ▁art ▁the ft ; ▁international ▁cultural ▁property ▁and ▁anti qu ities ▁cr imes ; ▁and ▁vis a ▁security . ▁H SI ▁agents ▁can ▁be ▁requested ▁to ▁provide ▁security ▁for ▁VI P s , ▁and ▁also ▁augment ▁the ▁U . S . ▁Secret ▁Service ▁during ▁over tax ed ▁times ▁such ▁as ▁special ▁security ▁events ▁and ▁elections . ▁ ▁H SI ▁was ▁formerly ▁known ▁as