Germany occupied Belgium and installed a military government. The occupiers imposed harsh taxes and strict rationing. Hundreds of thousands of Belgians laboured in Germany during the war, most as part of Germany's forced labour programme. Around 25,000 Jews and Romani were deported during the Holocaust in Belgium, most passing through the Mechelen transit camp. Nearly all lost their lives in the Nazi death camps. A number of Nazi collaborationist groups operated in Flanders and Wallonia; other Belgians collaborated through the national administration and the Flemish and Walloon Legions of the Waffen-SS. In opposition, the Belgian Resistance comprised numerous groups that fought against the occupation in various ways. Groupe G ran a successful campaign of sabotage against railroads, while other groups worked to protect Jewish people from deportation or help downed Allied airmen escape from the country.