61-year-old Karra met Congress President Sonia Gandhi and Vice President Rahul Gandhi here and was welcomed by them into the party.
Founder member of PDP along with late Mufti Mohammed Sayeed, Karra had submitted his resignation from the Lok Sabha in September last year protesting against the alleged excesses being committed by security forces in quelling widespread protests after the killing of Hizbul Mujahideen militant Burhan Wani.
The resignation was accepted by the Lok Sabha secretariat in November last year.
"The alliance between PDP and BJP had necessitated need for realignment of political forces in the state. Kashmir issue has been put in a deep slumber by the ruling alliance," he said.
Karra, whose uncle G M Sadiq was the first Congress chief minister of Jammu and Kashmir, said there was an urgent need for secular parties to come together to fight the "fascist forces in the state".
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