Many of them was using vs Many of them were using

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Some examples from the web:

• The group of farmers I met today were in beef and sheep farming, and many of them were using their single farm payment to subsidise their production.
• Many of today's manufacturing organizations are designed using vertical and hierarchical structures.
• Many of us will be using the services of the company LSG Lufthansa Skychef.
• You were using something much bigger.
• Many of our people still believe in Nox's message that justice, peace and equality can be attained using non-violent means.
• Greece, for example, has been using the same questionnaire since 2004 and many of the questions are out of date.
• Many of Parliament's other amendments were also endorsed in a general sense in the Council common position, using somewhat different wording.
• To date, many of the actions taken to deal with BSE have been carried out on a unilateral basis by Members using national measures.
• Israel is not a normal country because many of the present government's actions are completely unacceptable: building a fence, occupying territory, breaching human rights, using repression.
• We now have a large number of them, many of them overlap, some repeat the same subjects using different wording.
• It would be as if everyone in the world were using Commodore 64s and you were using a Cray supercomputer.
• Further to what Robert Sturdy has said, many of these pesticides and fungicides we are using, if they are used properly and you have the proper withdrawal period, pose no problems, and by using these particular chemicals we can produce very good food.
• You were using me as a human discount.
• Earth Republic Special Ops were using my sister as a lab rat.
• Coulson probably figured out we were using the barbershop.
• I figured you were using, because your notes were really disorganized.
• I thought you were using the guitar case.
• It's the van company they were using.
• They were using us for their cover.
• I mean, professional killers were using us.