Amanda Waller

Amanda Waller was the warden of Belle Reve Penitentiary.

History
Unbeknownst to Waller, Superboy and Miss Martian were undercover as Tommy and Tuppence Terror (the "Terror Twins"). When they arrived along with Mr. Freeze and Icicle Jr., Waller introduced herself and explained the basics of the inhibiter collars. She then stated the Prison's walls were thick enough to hold Superman (immediately stating that the Prison is the most impregnable building ever built), then stated no one has and never will escape Belle Reve.

After a "scuffle" in the mess hall, Mr. Freeze was brought before Waller. Freeze froze the prison guard, and broke his cuffs with a frost gauntlet. Waller activated his collar, but Freeze froze it off, and froze Waller's arm before she could fire a gun. Freeze shut down the collars and cell doors, allowing the prisoners to break free, and imprisoning Waller, Dr. Hugo Strange, and the guards in the cells.

When Brick spoke to Waller and the guards about their new orange uniforms with thermal devices keeping them warm, Waller said they'll be toast before they break out. She was grabbed by Brick through the bars. Hugo Strange convinced hm she was more valuable alive, and Brick told her to thank Hugo for saving her life.

Superboy (still disguised as Tommy Terror), turned the collars back on. This angered Icicle Sr., assuming Waller must've turned them back on. Before he could punch Waller, Hugo tackled Icicle Sr. and knocked him out. After Superboy walked out with Miss Martian, the prisoners were put back in their cells, and Belle Reve was scheduled to be up and running the next day.

Unfortunately, the breakout attempt cost Waller her job as warden. She was replaced by Hugo Strange as warden.