Jawaharlal Nehru was the first prime minister of India. Below is a quote from his autobiography.
Many a Congressman was a communalist under his national cloak
I am sure this sentence is grammatically correct but somehow I find it quite unnatural, particularly the "many a congressman was" part. Shouldn't this sentence be simply written as:
Many congressmen were communalist under their national cloak
Can someone please explain the above quote and maybe give some common examples of similar usage?