Watch the following movies in full:

https://www.imdb.com/title/tt0087985/

https://www.imdb.com/title/tt0879843/?ref_=nv_sr_srsg_3

https://www.imdb.com/title/tt1783244/

https://www.imdb.com/title/tt0103949/

https://www.imdb.com/title/tt0087553/?ref_=nv_sr_srsg_0
Know your enemy.
