diff --git a/src/main/java/com/metaweb/gridworks/GridworksServlet.java b/src/main/java/com/metaweb/gridworks/GridworksServlet.java
index f8ab11e48..d22480330 100644
--- a/src/main/java/com/metaweb/gridworks/GridworksServlet.java
+++ b/src/main/java/com/metaweb/gridworks/GridworksServlet.java
@@ -43,6 +43,7 @@ import com.metaweb.gridworks.commands.recon.ReconJudgeOneCellCommand;
 import com.metaweb.gridworks.commands.recon.ReconJudgeSimilarCellsCommand;
 import com.metaweb.gridworks.commands.recon.ReconMatchSpecificTopicCommand;
 import com.metaweb.gridworks.commands.recon.ReconcileCommand;
+import com.metaweb.gridworks.commands.util.CancelProcessesCommand;
 import com.metaweb.gridworks.commands.util.GetExpressionLanguageInfoCommand;
 import com.metaweb.gridworks.commands.util.GuessTypesOfColumnCommand;
 import com.metaweb.gridworks.commands.util.PreviewExpressionCommand;
@@ -68,6 +69,7 @@ public class GridworksServlet extends HttpServlet {
 		
 		_commands.put("undo-redo", new UndoRedoCommand());
 		_commands.put("apply-operations", new ApplyOperationsCommand());
+		_commands.put("cancel-processes", new CancelProcessesCommand());
 		
 		_commands.put("compute-facets", new ComputeFacetsCommand());
 		_commands.put("do-text-transform", new DoTextTransformCommand());
diff --git a/src/main/java/com/metaweb/gridworks/commands/util/CancelProcessesCommand.java b/src/main/java/com/metaweb/gridworks/commands/util/CancelProcessesCommand.java
new file mode 100644
index 000000000..f1906c63e
--- /dev/null
+++ b/src/main/java/com/metaweb/gridworks/commands/util/CancelProcessesCommand.java
@@ -0,0 +1,29 @@
+package com.metaweb.gridworks.commands.util;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import com.metaweb.gridworks.commands.Command;
+import com.metaweb.gridworks.model.Project;
+
+public class CancelProcessesCommand extends Command {
+	
+	@Override
+	public void doGet(HttpServletRequest request, HttpServletResponse response)
+			throws ServletException, IOException {
+		
+		try {
+            Project project = getProject(request);
+            project.processManager.cancelAll();
+            
+            response.setCharacterEncoding("UTF-8");
+            response.setHeader("Content-Type", "application/json");
+            response.getWriter().write("{ \"code\" : \"ok\" }");
+		} catch (Exception e) {
+			respondException(response, e);
+		}
+	}
+}
diff --git a/src/main/java/com/metaweb/gridworks/process/ProcessManager.java b/src/main/java/com/metaweb/gridworks/process/ProcessManager.java
index 209c795da..e090601eb 100644
--- a/src/main/java/com/metaweb/gridworks/process/ProcessManager.java
+++ b/src/main/java/com/metaweb/gridworks/process/ProcessManager.java
@@ -56,6 +56,15 @@ public class ProcessManager implements Jsonizable {
 		update();
 	}
 	
+	public void cancelAll() {
+		for (Process p : _processes) {
+			if (!p.isImmediate() && p.isRunning()) {
+				p.cancel();
+			}
+		}
+		_processes.clear();
+	}
+	
 	protected void update() {
 		while (_processes.size() > 0) {
 			Process p = _processes.get(0);