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Peggy carter, Howard stark were main founders

S.H.I.E.L.D. was founded by Howard Stark and Strategic Scientific Reserve Agent Peggy Carter. However, as revealed in Captain America: The Winter Soldier, S.H.I.E.L.D. was infiltrated by Hydra since its formation.

Hydra was not involved in the formation of shield

Hydra was not involved in the formation of the SHIELD