On January 14, 1940, John L. Lewis retired from the CIO presidency, and Philip Murray succeeded him.

On May 18, 1940, Pressman again spoke on CBS Radio, this time on the "Wagner Act."

In 1941, FDR appointed CIO vice president Sidney Hill to the Office of Production Management.
 Hillman lobbied for a mediating entity to OPM, and FDR created the National Defense Mediation Board (NDMB).
 In June 1941, NMDB and the United Auto Workers took over a North American Aviation factory during a strike.
Later in June 1941, at a convention of the National Lawyers Guild in Chicago, Pressman criticized the Vinson and Ball bills before the US Congress, both of which he accused of a "long-range" plan whose aims included "destruction of workers' rights to organize, bargain collectively, and strike"; "destruction of labor organizations as the barrier to unchecked monopoly profits"; and "complete control of the national economy and the government by big business."

Pressman continued to give as good as he got.
 In February 1940, he held a "heated exchange" with US Representative Clare Hatch during a hearing of the US House Labor Committee, again on the issue of amendments to the NRLA (Wagner Act):
Pressman: I'll answer the question all right, Mr. Hoffman.
 Representative Thomas can take care of himself.

Hoffman:  This boy is not going to tell me what to ask.
I won't take this from Pressman.
 Remember that.

Pressman:  I'll remember all I say.

Hoffman:  You keep a civil tongue in your head.

In September 1941, Pressman received a pin from pro-Communist Mike Quill, leader of the Transport Workers Union (TWU), a CIO member, during a TWU strike.
 Pressman then urged TWU strikers to stand up to the New York City government, as he had four years earlier in 1937 when the TWU first left the AFL for the CIO.

In July 1942, the National War Labor Board sought advice on FDR's wage stabilization policy by increasing wages in the four "Little Steel" companies with a combined 157,000 employees by one dollar.
CIO president Philip Murray and Pressman both supported the increase.

In July 1943, the CIO formed a political action committee, the "CIO-PAC," chaired by Sidney Hillman, and supported by Pressman and John Abt as co-counsels.
 In his 1999 memoir, Abt, general counsel for the Amalgamated Clothing Workers of America under Sidney Hillman, claimed the leaders of the Communist Party of the USA had inspired the idea of the CIO-PAC:
In 1943, Gene Dennis came to me and Lee Pressman to first raise the idea of a political action committee to organize labor support for Roosevelt in the approaching 1944 election.
Pressman approached Murray with the idea, as I did with Hillman.
Both men seized upon the proposal with great enthusiasm.

Thus, in 1943, as  American spy Elizabeth Bentley resurrected the Ware Group (of which Abt had been a member), could not risk involvement with her or the group.
Instead, the group reformed under Victor Perlo as the Perlo Group.

In September 1943 at a conference of the National Lawyers Guild, Pressman praised labor for reducing strikes and promoting the war effort.
He praised the National War Labor Board's policy for recognizing labor unions as institutions within the basic framework of our democratic society.
 He criticized "selfish blocs" in Congress that had opposed FDR's program.

In 1944, Pressman participated in resolution of a labor dispute of a national case in basic steel, involving some six hundreds unions on strike.
 The six-person board consisted of David L. Cole and Nathan P. Feisinger for the government, Philip Murry of the CIO with Pressman as counsel for unions, John Stevens with Chester McLain of U.S. Steel for industry.

During 1945–1947, Pressman worked with John Abt for the CIO to help create the World Federation of Trade Unions (WFTU) as successor to the International Federation of Trade Unions, itself seen as dominated by communist and socialist parties.
 During formation of the WFTU and in working with pro-Soviet American unions, "the active role played by" Pressman "in writing and rewriting convention resolutions help
On January 14, 1940, John L. Lewis retired from the CIO presidency, and Philip Murray succeeded him.
On May 18, 1940, Pressman again spoke on CBS Radio, this time on the "Wagner Act."
In 1941, FDR appointed CIO vice president Sidney Hill to the Office of Production Management.  Hillman lobbied for a mediating entity to OPM, and FDR created the National Defense Mediation Board (NDMB).  In June 1941, NMDB and the United Auto Workers took over a North American Aviation factory during a strike. Later in June 1941, at a convention of the National Lawyers Guild in Chicago, Pressman criticized the Vinson and Ball bills before the US Congress, both of which he accused of a "long-range" plan whose aims included "destruction of workers' rights to organize, bargain collectively, and strike"; "destruction of labor organizations as the barrier to unchecked monopoly profits"; and "complete control of the national economy and the government by big business."
Pressman continued to give as good as he got.  In February 1940, he held a "heated exchange" with US Representative Clare Hatch during a hearing of the US House Labor Committee, again on the issue of amendments to the NRLA (Wagner Act):
Pressman: I'll answer the question all right, Mr. Hoffman.  Representative Thomas can take care of himself.
Hoffman:  This boy is not going to tell me what to ask. I won't take this from Pressman.  Remember that.
Pressman:  I'll remember all I say.
Hoffman:  You keep a civil tongue in your head.
In September 1941, Pressman received a pin from pro-Communist Mike Quill, leader of the Transport Workers Union (TWU), a CIO member, during a TWU strike.  Pressman then urged TWU strikers to stand up to the New York City government, as he had four years earlier in 1937 when the TWU first left the AFL for the CIO.
In July 1942, the National War Labor Board sought advice on FDR's wage stabilization policy by increasing wages in the four "Little Steel" companies with a combined 157,000 employees by one dollar. CIO president Philip Murray and Pressman both supported the increase.
In July 1943, the CIO formed a political action committee, the "CIO-PAC," chaired by Sidney Hillman, and supported by Pressman and John Abt as co-counsels.  In his 1999 memoir, Abt, general counsel for the Amalgamated Clothing Workers of America under Sidney Hillman, claimed the leaders of the Communist Party of the USA had inspired the idea of the CIO-PAC:
In 1943, Gene Dennis came to me and Lee Pressman to first raise the idea of a political action committee to organize labor support for Roosevelt in the approaching 1944 election. Pressman approached Murray with the idea, as I did with Hillman. Both men seized upon the proposal with great enthusiasm.
Thus, in 1943, as  American spy Elizabeth Bentley resurrected the Ware Group (of which Abt had been a member), could not risk involvement with her or the group. Instead, the group reformed under Victor Perlo as the Perlo Group.
In September 1943 at a conference of the National Lawyers Guild, Pressman praised labor for reducing strikes and promoting the war effort. He praised the National War Labor Board's policy for recognizing labor unions as institutions within the basic framework of our democratic society.  He criticized "selfish blocs" in Congress that had opposed FDR's program.
In 1944, Pressman participated in resolution of a labor dispute of a national case in basic steel, involving some six hundreds unions on strike.  The six-person board consisted of David L. Cole and Nathan P. Feisinger for the government, Philip Murry of the CIO with Pressman as counsel for unions, John Stevens with Chester McLain of U.S. Steel for industry.
During 1945–1947, Pressman worked with John Abt for the CIO to help create the World Federation of Trade Unions (WFTU) as successor to the International Federation of Trade Unions, itself seen as dominated by communist and socialist parties.  During formation of the WFTU and in working with pro-Soviet American unions, "the active role played by" Pressman "in writing and rewriting convention resolutions help
Lee Pressman