Martin Bloch is alive today only because his mother knew before many others the genocidal horrors that the Nazis would inflict during World War II. Bloch’s mother knew being rounded up and place the Ivje Ghetto in Belarus in 1941 was a death sentence, so in December she and her two young sons escaped through barbed wire to a Christian farmer she knew. Days later the remaining Jews in Ivje were killed. Bloch’s father had been killed by the Germans in August. Bloch, now 89, will be the guest speaker at Bayonne’s annual Holocaust Remembrance Service Monday in the Dorothy Harrington City Council C…