The factional rivalry between the Syndicate and Indira Gandhi came into the open during the Presidential Election of 1969. This election was a significant turning point in Indian politics as it marked the beginning of a major rift within the ruling Congress party.

1. Background:
- The Syndicate was a group of powerful regional leaders within the Congress party who had significant control over the party's affairs.
- Indira Gandhi, the daughter of former Prime Minister Jawaharlal Nehru, had become the Prime Minister in 1966. However, she faced opposition from the Syndicate who felt threatened by her growing popularity and independent decision-making.

2. Presidential Election, 1969:
- The Presidential Election of 1969 was a contest between the official candidate of the Syndicate, Neelam Sanjiva Reddy, and the candidate supported by Indira Gandhi, V.V. Giri.
- Indira Gandhi openly defied the Syndicate by supporting Giri, who was a Congress dissident. This move was seen as a direct challenge to the authority of the Syndicate.
- Giri eventually won the election with the support of Indira Gandhi and some opposition parties. This victory was a significant blow to the Syndicate's control over the Congress party.

3. Consequences:
- The open factional rivalry between the Syndicate and Indira Gandhi after the Presidential Election led to a split within the Congress party.
- In 1969, Indira Gandhi formed a new faction known as Congress (R) or Congress (Requisitionists) that was loyal to her. The Syndicate, on the other hand, continued to control the Congress (O) or the old Congress.
- The split within the Congress party had far-reaching implications for Indian politics. It led to a period of political instability and frequent changes in government at both the state and national levels.

In conclusion, the factional rivalry between the Syndicate and Indira Gandhi came into the open during the Presidential Election of 1969. This election marked the beginning of a major rift within the ruling Congress party and eventually led to a split, resulting in the formation of two factions - Congress (R) and Congress (O). The consequences of this split had a significant impact on Indian politics, leading to a period of political instability.