Diatribe (noun)

1. A strong and bitter verbal attack or criticism.
2. A long, angry, or bitter speech or writing that criticizes or denounces someone or something.

Origin:

From greek diatribē, meaning "a discourse or a talk".

Examples:

1. The newspaper article was a diatribe against the government's policies.
2. He launched into a diatribe against the company's management.
3. The diatribe was filled with personal attacks and accusations.
4. The diatribe was a harsh criticism of the current political situation.
5. The diatribe was a bitter and emotional outpouring of frustration.