| Pal of Marx |
| Marx's friend |
| Marx co-author |
| Marx colleague |
| Marx associate |
| Associate of Marx |
| Marx collaborator |
| Manifesto co-author |
| Marx's collaborator |
| Communist Friedrich |
| 'Das Kapital' editor |
| Collaborator of Marx |
| Anti-Dühring" author |
| Associate of Karl Marx |
| Karl Marx's associate. |
| Collaborator with Marx |
| Famous German socialist |
| 1848 manifesto co-author |
| Manifesto writer of 1848 |
| ___ law (spending theory) |
| Marx's manifesto co-author |
| Communist Manifesto" co-author |
| ''Communist Manifesto'' coauthor |
| Editor of two "Das Kapital" volumes |
| ''The Communist Manifesto'' co-author |
| Co-author of "The Communist Manifesto |
| Communist Manifesto" co-author with Marx |
| Co-author of the Communist Manifesto, 1848 |
| German philosopher and collaborator of Marx |
| Marx's collaborator on "The Communist Manifesto |
| The Condition of the Working Class in England" author |