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This is a 1999 Redline Conquest frame whose rear derailleur engaged the spokes of the rear wheel.
When this happens, the mass of the bicycle at whatever speed it's moving is decelerated by the derailleur. It's the same amount of energy as accelerating the bike to that speed except more sudden. It's no wonder, then, that derailleur pivots tear, bodies snap and frames fail. 
Redline has been our main and often only supplier of twenty inch since the 1970s. They are still owned by the guy who started the company and are one of the few "independent" manufacturers in that market. With a solid reputation for building BMX and freestyle frames that do not break under horrendous abuse, Redline expanded their product line into cyclocross frames in 1999 and took the US National Cyclocross Championship first year out (repeated in 2000!) These first year bikes have a large aluminum frame end ("dropout") and this particular one was badly mangled.
I have replaced a couple of hundred steel ends in steel frames but I do not have the neccessary equipment to weld aluminum. Moreover I am not qualified to estimate the effects of welding in an otherwise tempered piece. Might be OK, maybe not, but I don't know.
The 2000 and 2001 models use a replaceable aluminum derailleur hanger and we stock it. With a carbide steel rotary file in a die grinder and careful measurement I shaped the stump to accept the new tab 
I can repair many frame failures, call or email. It's not expensive to ship frames and I'm prompt, usually overnight turnaround.
more frame repair
We sell frame ends for many frames
