Birmingham City Council is putting the NEC Group up for sale. The group includes the National Exhibition Centre, the International Convention Centre, the National Indoor Arena and the LG Arena.
It is claimed the group brings in four million visitors and £2 billion to the region every year, and supports 30,000 jobs.
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Six Polish men were found at the two businesses, some living at sites, they are thought to have been paid around £1 an hour.
Tahir Mahmood was detained by Police as he was attempting to climb into the roof space of an out-building at his family’s home.
Family man Mr Javeed was the owner of Digbeth business Direct Source 3 and was shot and killed on February 3.