Because of the Cats (1973)

 Because of the Cats (1973)

A gang of six wealthy, well-dressed and well-spoken hoodlums 

break into a married couple's house and rape the wife while 

forcing the husband to watch. Thus begins a dogged investigation 

by a determined detective who quickly finds that their cult-like 

solidarity can be a serious obstacle to breaking them. 

(Brian J. Wright IMDB)