The Jewish Federation of San Francisco, the Peninsula, Marin and Sonoma, as well as the organization’s Jewish Communal Fund, are laying off 33 employees, according to a blog item on The Fundermentalist, writer Jacob Berkman’s blog on the JTA new service’s Web site. A letter from the federation’s cheif executive, Jennifer Gorovitz, to federation employees, included in the news report, indicates the organization has also reduced grant allocations to the nonprofit groups it supports.