Why does the Communist Manifeso call for State or Government ownership of the means o

[tradeunionsupporter]

Does the State or the Government need to own the means of production for the purpose of rationing resources ?
Chapter II. Proletarians and Communists

7. Extension of factories and instruments of production owned by the State; the bringing into cultivation of waste-lands, and the improvement of the soil generally in accordance with a common plan.

http://www.marxists.org/archive/marx/works/1848/communist-manifesto/ch02.htm

[tbasherizer]

Karl Marx advocates state ownership of the means of production in the Manifesto not in order to affect the rationing of resources, but their emancipation. During conventional wartime(WWI and WWII), liberal-democratic governments may nationalize a few companies or parts of industry in order to ration the supply of potential war materiel and redirect its biggest portion to the war effort.
The kind of nationalization Karl Marx is talking about in the Manifesto is completely different from this. In Marx's other books, he often wrote about workers' "alienation from the means of production", meaning their isolation from the product of their labour.
Nationalization of industry means to address this by putting the means of production, ergo the product of workers' labour, into the hands of the people. This of course requires a truly democratic government, unlike the modern state; a dictatorship of the proletariat in other words.

[La Comédie Noire]

Mind you he wrote that in 48, he changed his mind substantially by the time he died in 83, just look up the things he wrote about the Paris commune.