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Frej was born in Kafr Qasim, Israel, to a Muslim-Arab family. His grandfather was killed in the Kafr Qasim massacre, Frej is the eldest of twelve children. In 1982, he began studying accounting and economics at the Hebrew University of Jerusalem, and later worked as an accountant. Whilst at university, he joined the joint Jewish-Arab "Campus" group, and subsequently joined the Ratz party, which later merged into Meretz. He served on the secretariat of Peace Now, and was involved in the Geneva Accord.