Utilize the search functionality in the Data Catalog to look for 'employee_nu'.

Develop a shell script to iterate through all organization projects, using the bq command line tool to search for tables with the 'employee_nu' column.

Create a shell script to loop through all projects, executing a query on the INFORMATION_SCHEMA.COLUMNS view to locate the 'employee_nu' column.

Implement a Dataflow job to scan all projects, querying the INFORMATION_SCHEMA.COLUMNS view for the 'employee_nu' column.