Socialist Revolutionary Party
After he did nothing to prevent a bloody wave of anti-Jewish violence in 1903, the known double agent Yevno Azef decided not to inform on the Socialist Revolutionary Party plans to kill Plehve. He survived one attack in 1903 and two in 1904 before the Socialist-Revolutionary Combat Organization succeeded. On 28 July 1904, a bomb was thrown into Plehve's horse-drawn carriage by a member of the Socialist Revolutionary Party named Yegor Sozonov, on his weekly audience with the Tsar at Izmailovsky Prospekt in Saint Petersburg, killing him.