WW2

Textbook lesson: This is what happens when you let scientists off-the-leash ...

Japan's Unit 731 in Manchuria - with it's 3000 scientists - engineered/released an intermediate species - plague-infected fleas. Wound up killing 10 000 Chinese at least.  Meanwhile back at the lab: STAGE 3 TRIALS were conducted on POW's - inoculated with u-name-it deadly bio-bugs from anthrax to cholera - to evaluate promising candidates.

At the hearings an official admitted it was most regrettable from the view point of humanity

That was quite prophetic, as it turns out. The UK was right into developing bio-warfare tech - Porton Down Biological Research Centre's Anthrax Island is one example.  Winston Churchill personally ordered the great-leap-forward in bio-warfare.  Bombs laden with anthrax spores dropped by airplanes, or mortar-launched, which proved to be the best, released a white cloud of fine powder on tethered sheep .  Which died horrible anthrax deaths needless to say.  So it was a big success. 

Denied/lied about for decades, blamed on unsanitary Greeks, natural causes - even as livestock in neighbouring areas started mysteriously dropping dead. 

Meanwhile: the anthrax spores dispersed on the island, lived happily on.

Defense Ministry only fessed-up when Dark Harvest activists left a bucket of contaminated soil from the island outside  Porton Downs Lab HQ in Wiltshire.  Technically an act of terrorism - but Defence Ministry had denied the island was contaminated.  Caught in their own conundrum, Defence announced that emerging information had shown blah blah blah - i.e they admitted it - pledged to clean the island up.  Be more transparent next time ...

First the military tried scorch-earthing it - setting the whole island alight - but that failed - so finally, quote: the land was decontaminated by using formaldehyde - which makes a great Govt oxymoron at least. 

The British were also accused by the Germans of trying to import yellow fever into India.  The UK denies it.  Who knows?

Funnily enough, Hitler was the only one who refused to develop bio-warfare tech.  He thought it was unethical.  What does that tell ya?