Warren’s full speech is available at archive.org:
“Unfortunately, however, many of our people and some of our authorities and, I am afraid, many of our people in other parts of the country are of the opinion that because we have had no sabotage and no fifth column activities in this State since the beginning of the war, that means that none have been planned for us. But I take the view that that is the most ominous sign in our whole situation. It convinces me more than perhaps any other factor that the sabotage that we are to get, the fifth column activities that we are to get, are timed just like Pearl Harbor was timed and just like the invasion of France, and of Denmark, and of Norway, and all those other countries.”
Hon. Earl Warren, pg 11011-11012, San Francisco Hearings, February 21 and 23, 1942, part 29, National Defense Migration
https://archive.org/details/nationaldefensem29unit
Warren’s full speech is available at archive.org: “Unfortunately, however, many of our people and some of our authorities and, I am afraid, many of our people in other parts of the country are of the opinion that because we have had no sabotage and no fifth column activities in this State since the beginning of the war, that means that none have been planned for us. But I take the view that that is the most ominous sign in our whole situation. It convinces me more than perhaps any other factor that the sabotage that we are to get, the fifth column activities that we are to get, are timed just like Pearl Harbor was timed and just like the invasion of France, and of Denmark, and of Norway, and all those other countries.” Hon. Earl Warren, pg 11011-11012, San Francisco Hearings, February 21 and 23, 1942, part 29, National Defense Migration https://archive.org/details/nationaldefensem29unit