BJP president Amit Shah will begin his two-day Tripura visit on Sturday to lay the groundwork for the party's expansion in the Northeastern state the Left has ruled for the last 19 years.

Shah, the architect of several electoral victories of the BJP, is likely to flag alleged lack of development of the state under the Left government and violence against his party workers.

Tripura, with only two Lok Sabha seats, may not be electorally crucial to the BJP's fortunes at the national level but the state now figures high on Shah's priority list as assembly polls there are due next year.

The BJP chief, known for his aggressive brand of politics, was instrumental in salvaging Goa for the party earlier this year when it had finished second after Congress in the assembly election, and neither party got a majority.

He had quickly despatched Union minister Nitin Gadkari to cobble together a majority with the help of smaller regional parties and managed to form a BJP-led government in the tiny coastal state.

Shah will take stock of the party's organisational work in meetings with state BJP leaders and hold a public rally on Sunday.

With the BJP and RSS activists allegedly at the receiving end of violence by the ruling Left, traditionally seen as an ideological foe by saffron groups in Kerala and Tripura, the BJP chief has been devoting considerable time to strengthen the organisation in the two states.

Having forfeited security deposit in 47 of the 50 seats it contested in Tripura in the 2013 assembly election, the BJP has increased its vote share and its candidates finished second to winning CPI-M nominees in three bypolls held there since.

BJP leaders claim the party has emerged as the principal challenger to the Left and pointed to the recent defection of a top Trinamool Congress leader and some others to the party.

Less than a week after the BJP formed government in neighbouring Manipur, virtually the entire state unit of the Trinamool Congress in Tripura had joined the saffron party.

The revolt was led by Ratan Chakrabarty, chairman of the state TMC coordination committee. Chakrabarty had joined BJP with 15 other members of the state committee.

"The BJP has emerged as a strong alternative in the state. It is seen by people as a symbol of development and hope as the state has witnessed no progress and the Left has used organised violence to target us," its national media head Anil Baluni said.

The party has increased the number of its primary members to 2 lakh in the state from 15000 in 2014, he said.

The saffron rise has prompted the Left cadres to attack its workers more and more, the BJP leader said, citing 10 such instances recently.

The Left leaders have, however, consistently denied the allegations and instead blamed the BJP for fanning violence.

CPI-M's Manik Sarkar has been the state's chief minister since 1998.

In 2013, he led his party to a resounding win in 50 out of the state's 60 assembly seats with the Congress pocketing the rest.

However, the Congress' tie-up with the Left in West Bengal led to a mass desertion in its ranks in Tripura. A nation-wide surge in the BJP's vote share has given the saffron party hope that it can repeat the success in Tripura when it goes to the polls early next year.