Partial list of alphabet agencies
Agencies created between 1933 and 1938 are New Deal Agencies.

Initialism Year Agency
AAA 1933 Agricultural Adjustment Administration
BPA 1937 Bonneville Power Administration
CAA 1938 Civil Aeronautics Authority (early Federal Aviation Administration)
CCC 1933 Civilian Conservation Corps
CWA 1933 Civil Works Administration
DRS 1935 Drought Relief Service
DSH 1933 Subsistence Homesteads Division
EBA 1933 Emergency Banking Act
EPA 1970 Environmental Protection Agency
FAA 1958 Federal Aviation Agency
FAP 1935 Federal Art Project (part of WPA)
FCA 1933 Farm Credit Administration
FCC 1934 Federal Communications Commission
FDA 1906 Food and Drug Administration
FDIC 1933 Federal Deposit Insurance Corporation
FERA 1933 Federal Emergency Relief Administration
FHA 1934 Federal Housing Administration
FLSA 1938 Fair Labor Standards Act
FMP 1935 Federal Music Project (part of WPA)
FSA 1935 Farm Security Administration
FSRC 1933 Federal Surplus Relief Corporation
FTP 1935 Federal Theatre Project (part of WPA)
FWA 1939 Federal Works Agency
FWP 1935 Federal Writers' Project (part of WPA)
HOLC 1933 Home Owners' Loan Corporation
IRS 1862 Internal Revenue Service
LUP 1934 Land Utilization Program
NASA 1958 National Aeronautics and Space Administration
NIRA 1933 National Industrial Recovery Act
NLRA 1935 National Labor Relations Act
NLRB 1934 National Labor Relations Board/The Wagner Act
NRA 1933 National Recovery Administration
NYA 1935 National Youth Administration
PRRA 1933 Puerto Rico Reconstruction Administration
PWA 1933 Public Works Administration
RA 1935 Resettlement Administration
REA 1935 Rural Electrification Administration (now Rural Utilities Service)
SEC 1934 Securities and Exchange Commission
SES 1933 Soil Erosion Service
SSB (now SSA) 1935 Social Security Board (now Social Security Administration)
TVA 1933 Tennessee Valley Authority
USHA 1937 United States Housing Authority
USMC 1936 United States Maritime Commission
USPS 1792 United States Postal Service (then the Post Office Department)
WPA 1935 Works Progress Administration
In national security
Initialism Year Agency
ATF 1972 Bureau of Alcohol, Tobacco, Firearms and Explosives
CIA 1947 Central Intelligence Agency
DEA 1973 Drug Enforcement Administration
DIA 1961 Defense Intelligence Agency
DHS 2002 Department of Homeland Security
DOJ 1870 Department of Justice
FBI 1908 Federal Bureau of Investigation
FEMA 1979 Federal Emergency Management Agency