Political Aspects of Full Employment
Why do capitalists hate full employment? Because it weakens their power over workers.

Unemployed women at a Federal Emergency Relief Administration camp in Arcola, PA circa July 1934. National Archives and Records Administration
A solid majority of economists is now of the opinion that, even in a capitalist system, full employment may be secured by a government spending program, provided there is in existence an adequate plan to employ all existing labor power, and provided adequate supplies of necessary foreign raw materials may be obtained in exchange for exports.
If the government undertakes public investment (e.g. builds schools, hospitals, and highways) or subsidizes mass consumption (by family allowances, reduction of indirect taxation, or subsidies to keep down the prices of necessities), and if, moreover, this expenditure is financed by borrowing and not by taxation (which could affect adversely private investment and consumption), the effective demand for goods and services may be increased up to a point where full employment is achieved. Such government expenditure increases employment, be it noted, not only directly but indirectly as well, since the higher incomes caused by it result in a secondary increase in demand for consumer and investment goods.
It may be asked where the public will get the money to lend to the government if they do not curtail their investment and consumption. To understand this process it is best, I think, to imagine for a moment that the government pays its suppliers in government securities. The suppliers will, in general, not retain these securities but put them into circulation while buying other goods and services, and so on, until finally these securities will reach persons or firms which retain them as interest-yielding assets. In any period of time the total increase in government securities in the possession (transitory or final) of persons and firms will be equal to the goods and services sold to the government. Thus what the economy lends to the government are goods and services whose production is “financed” by government securities. In reality the government pays for the services, not in securities, but in cash, but it simultaneously issues securities and so drains the cash off; and this is equivalent to the imaginary process described above.