Strike Under was founded in 1979 or 1980. Although American punk is generally considered to have started 4 or 5 years earlier, punk and New Wave music arrived in Chicago far later than on either coast, so that Strike Under is correctly still considered an "early" Chicago punk band. They can also be seen as one of the first and most important bands of the "second wave" of Chicago punk, as it turned toward a more hardcore scene and sound, and as an archetype of Chicago hardcore.
Strike Under in 1981 released a 5-song 12" LP record, Immediate Action, notable as the first release by the new label Wax Trax Records (WAX 001, possibly re-released as Wax Trax 103015X) The album cover resembles a book of matches (the band's name derives from the phrase commonly seen on cheap matchbooks). Songs include Sunday Night Disorientation, Context, Closing In / Elephant's Graveyard (which later appeared on the Wax Trax Best of boxed set), and the title track. Immediate Action receives mixed reviews; however, as one of the first actual recordings by a local punk outfit in the Windy City, looms large in the memory of denizens of the early Chicago punk scene, and has been called an "integral document to the history of punk rock in Chicago"
Strike Under, besides releasing its own record, played out at clubs such as O'Banion's and also appeared on the seminal 1981 Busted at Oz LP, which is usually viewed as an historic document of the second wave of Chicago punk, recorded at the legendary club Oz before it closed down.
Strike Under broke up in late 1981. Steve Bjorklund briefly formed another Chicago punk band, Terminal Beach , then ultimately relocated to Minneapolis to pursue playing and recording with various punk and industrial music bands. The other 3 members formed Trial By Fire, which played throughout Chicago in 1982. After Trial By Fire broke up, Pierre Kezdy went on to play with Naked Raygun. Chris Bjorklund played with The Effigies during the mid-1980s, another leading 1980s hardcore band, fronted by Pierre Kezdy's brother, John Kezdy.