The Communist Party of India is the oldest communist party in India. The CPI was founded in modern-day Kanpur on 26 December 1925.
In 1964, a split in the CPI caused the formation of the Communist Party of India, the largest communist party in India.
Currently, the CPI has two members in Lok Sabha and two members in Rajya Sabha. In addition, it has 22 MLAs across four states and one in each MLC in Bihar and Telangana. It has the current ECI status of a state party in Tamil Nadu, Kerala, and Manipur. From Wikipedia
