push around vs rule with a rod of iron

push around

verb
  • To treat contemptuously and unfairly; to bully 

  • Used other than figuratively or idiomatically: see push, around. 

rule with a rod of iron

verb
  • To rule with stern severity. 

How often have the words push around and rule with a rod of iron occurred in a corpus of books? (source: Google Ngram Viewer )