<<These families came to Fitchburg, Gardner, Athol, Worcester in western Massachusetts starting around 1907. The Friedson's moved on to Springfield and some of the Aisenberg's moved to Leomister...why did Jews settle in that area.>>
My guess would be industry. These areas were all riverside industrial centers in the late 19th and early 20th centuries, and they attracted many immigrants to work in the mills. Gardner was the "furniture capital of New England." Leominster was known for its comb industry (and later, plastics). Fitchburg was on a rail line between Boston and Albany, and machine tools, clothing, and paper were all produced there. Textiles and leather were among the goods made in Athol. Immigrants probably managed or owned some of the factories, too.
BTW, I wouldn't characterize these cities as being in western Massachusetts, but rather north-central Massachusetts.
Ellen Morosoff Pemrick
Researching WEISSMAN/VAYSMAN (Ostropol, Ukraine); MOROZ and ESTRIN/ESTERKIN (Shklov & Bykhov, Belarus); LESSER/LESZEROVITZ, MAIMAN, and BARNETT/BEINHART/BERNHART (Lithuania/Latvia); and ROSENSWEIG/ROSENZWEIG, KIRSCHEN, and SCHWARTZ (Botosani, Romania)