Violet writes: The “Poor” authority record as it stands January 2021:
150 __ Poor
450 __ Disadvantaged, Economically
450 __ Economically disadvantaged
450 __ Impoverished people
450 __ Low-income people
450 __ Pauperism
450 __ Poor |x Economic conditions
450 __ Poor, The
450 __ Poor people
550 __ |w g |a Persons
550 __ |w g |a Social classes
550 __ Poverty
Some libraries have changed the LCSH “Poor” to “Poor people” (see, for example, Duke University Libraries).
For more history about subject headings relating to poor people, see the report of the “SAC Task Force on Library of Congress Subject Heading Revisions Relating to the Poor People’s Policy,” which was released January 2000. For even more information, see the LC Response to SAC Task Force on LCSH Revision Relating to Poor People’s Policy(“Of the fifteen new headings recommended for addition to LCSH by the Task Force, fourteen have been or are being added to LCSH, with one in a slightly revised form.”) as well as Sandy Berman’s comments on the task force report.
Poor is preferrable