On December 3, 1940, President Roosevelt wrote to Attorney General Robert H. Jackson: "I have been getting a lot of complaints about our friend Rogge–that he is a self-seeker and that he is overbearing.

[9] In 1943, Rogge returned to the Justice Department as a special assistant to the Attorney General and in 1944 served as prosecutor in the federal government's prosecution of 33 isolationist and Nazi sympathizers for sedition.

[19] Upset at Clark's suppression of his report, Rogge began speaking out publicly to warn of the continuing fascist threat to the United States.

'"[20] Speaking to a political science class at Swarthmore College on October 22, Rogge described Nazi efforts to defeat FDR's re-election in 1936, 1940, and 1944.

He identified John L. Lewis of the United Mine Workers and William Rhodes Davis, a business executive in the oil industry, as the Nazis' principal targets in the U.S. and detailed the cooperation between those two.

He said he intended to continue speaking publicly about the dangers of fascism and criticized recent decisions of the Justice Department: "The country has a crying need for more statesmen and fewer politicians.

I am glad he is, but I would judge that his speeches were based on official files just as mine were.He summed up the politics surrounding his dismissal saying: "Wheeler was closer to President Truman than I was.

"[23] In 1946, PM published some of Rogge's findings into the inter-relationship during the 1930s and war years of authoritarian beliefs, armed militia groups, antisemitism and collusion between elected U.S. politicians and the German Nazi propaganda mill.

[21][13][26][27] In October 1947, Rogge started his own firm based in New York City and Paris to focus on corporate law practice and tax work.

[28] He served as defense attorney for some of the defendants charged with contempt of Congress for withholding records of the Joint Anti-Fascist Refugee Committee.

In November 1947, he attacked Clark, claiming that he was "leaking to picked newspaper men" reports about the special Federal grand jury investigation of subversive activities then sitting in New York.

[39] In 1949, in contentious testimony before the Senate Judiciary Committee, Rogge sharply attacked the nomination of Attorney General Clark to a seat on the Supreme Court.

He condemned him for issuing lists of subversive organizations in an attempt to "out-Dies the Dies Committee", for maintaining "blacklists", approving extensive wire-tapping, and promoting "a loyalty witch hunt" and "a cold war against anyone who engaged in independent thinking."

"[40] On October 10, 1949, as part of a delegation from the National Non-Partisan Committee that included Paul Robeson, he visited the Department of Justice asking that the indictments against twelve Communist leaders be quashed.

In June 1950, David Greenglass, a former employee at the Los Alamos nuclear center, was arrested on charges of passing information about the atomic bomb to Soviet agents.