To track a specific industry, such as sugar refining, in the Census or American Community Survey, you may be better off using IND rather than IND1950. The variable IND1950 harmonizes industries (as reported in IND) from 1850-2022 into the 1950 Census Bureau industrial classification system. IND1950 is not intended to be used to track highly detailed groups of workers, but rather to facilitate analysis of industries across a wide range of years of data. If you can share more about the specific year(s) you are interested in, I can likely provide information on how you could determine how individuals in the sugar refining industry are coded in IND. Alternatively, you could reference a particular year’s index of industries and occupations from the Census Bureau, which provides a full list of the exact industries that were coded into the broader industry codes. I have linked to these indices from 1940-2016 below, which may be a good starting point for you.
1940 Alphabetical Index of Occupations and Industries
1950 Alphabetical Index of Industries and Occupations
1960 Alphabetical Index of Industries and Occupations
1970 Alphabetical Index of Industries and Occupations
1980 Alphabetical Index of Industries and Occupations
1990 Alphabetical Index of Industries and Occupations
Census 2000 Occupation Index (Excel file)
Census 2002 Occupation Index (Excel file)