It is hard, if not impossible, to say when the Animal/Earth Liberation movement first started. A study of the subject literally takes you back thousands of years to 200 B.C. when people like Pythagoras advocated vegetarianism & animal compassion on spiritual grounds, and to the 1st century A.D. when Plutarch wrote what is widely regarded as the first animal rights literature.
However, the reader will be delighted to know that I am not going to bore you to death with 2000 years of waffle. Instead, I merely intend to look at what occurred 30 years ago this year. But first, to fully understand the events of 30 years ago, we must look slightly further back than that, to the events of 1964.